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04-27-2010, 04:46 PM
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#1 |
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Registered User
Join Date: Dec 2009
Location: Milton, FL
Posts: 733
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Dumping Exhaust Under Truck?
I recently put some new mufflers on my truck, and I'm happy with their sound but the passenger side tail pipe is at a downward angle now (previous exhaust was fully welded, I cut off old mufflers and clamped new ones on, passenger side was welded at a funny angle and now it's changed the tailpipe angle) so I've been thinking about cutting the tail pipes off right behind the mufflers and possibly putting turndowns on it, but I can't make up my mind. Someone wanna pitch in some ideas?
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04-27-2010, 04:50 PM
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#2 |
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El Mero Mero Frijolero!!
Join Date: Mar 2010
Location: Lubbock, Texas
Posts: 669
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Re: Dumping Exhaust Under Truck?
I have mine dumped before the rear axle.
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My Toys: 1993 Ford Mustang LX 5.0 2001 Yamaha V Star 650 1984 Silverado > Build Page < |
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04-27-2010, 04:51 PM
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#3 |
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Registered User
Join Date: Mar 2009
Location: MD
Posts: 417
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Re: Dumping Exhaust Under Truck?
You could always dump them out the sides in front of the rear wheels.
__________________
2006 Silverado Crew Cab 1500 4x4 5.3L automatic 1986 M1008 CUCV 6.2L Detroit Diesel TH400 4.56 Detroit Locker rear NP208 1973 K20 "Silverado" 350ci, HEI, TH350, NP203 with 2wd conversion, A/C, power windows,tilt wheel, dual tanks. My '73ish K20 thread My 5yo son claims it as his. 1987 V20 Custom Deluxe 350 TH400 NP208 "farm truck" getting parted out. 2016 Nissan Altima grocery getter/commuter |
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04-27-2010, 05:13 PM
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#4 | |
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Registered User
Join Date: Dec 2009
Location: Milton, FL
Posts: 733
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Re: Dumping Exhaust Under Truck?
Quote:
And someone told me, since I have aluminum wheels, that having it exit in front of the tires will warp my aluminum wheels. Never heard that before but I wanna make sure before I do it. |
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04-27-2010, 05:29 PM
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#5 |
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Registered User
 
Join Date: Dec 2008
Location: Providence Rhode Island
Posts: 404
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Re: Dumping Exhaust Under Truck?
if you can dump the exhaust out the side. I had turndowns under the truck and it sounded funny as the sound vibrated off the bottom of the truck and off the ground
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04-27-2010, 04:51 PM
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#6 |
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Registered User
Join Date: May 2007
Location: Alabama
Posts: 241
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Re: Dumping Exhaust Under Truck?
Both my 90 and my 84 have the exhaust cut off at the muffler. The exhaust has a drone at hiway speeds but if a little noise doesnt bother you it isnt that bad. If you have a sliding back window you will get some exhaust in the cab if sitting at a red light.
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88 Chevy C1500, step side, LS swap. 98 Crew Cab Dually, tow rig. 03 Dodge Neon. ECTA Ohio Mile record holder. |
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04-27-2010, 05:32 PM
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#7 |
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Insert Witty Text Here
Join Date: Oct 2002
Location: San Antonio, TX
Posts: 3,415
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Re: Dumping Exhaust Under Truck?
FWIW, I hate driving behind people with turndowns in a parking lot. They kick up dirt and gravel with their exhaust at low speeds.
Slonaker |
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04-27-2010, 05:38 PM
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#8 |
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Registered User
Join Date: Oct 2002
Location: Edmond, OK
Posts: 5,904
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Re: Dumping Exhaust Under Truck?
I had mine dumped and it covered rear axle in blackness... perhaps the carb was a bit out of tune, but none the less.
Mine sounded great...
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Jon 1982 Chevy Silverado 350/th350.... RETIRED 1993 Jeep XJ 2 door(Cherokee) 4wd 4.0ltr/AX-15 (5spd)/NP231 .... Oklahoma Roll Call |
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04-27-2010, 05:51 PM
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#9 |
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Badass
Join Date: Jan 2009
Location: lox. fl
Posts: 4,586
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Re: Dumping Exhaust Under Truck?
i have turn downs under my truck they sound good. yes they down put up some dust on a dirt road but its worth it
__________________
Think outside the box? -84c10 (1stcar)→My Build←  -00 Saturn 5spd drop a gear and disappear! 1/4:13:90
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04-27-2010, 05:51 PM
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#10 |
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Registered User
Join Date: Aug 2009
Location: ftw tex
Posts: 682
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Re: Dumping Exhaust Under Truck?
i prefure dumped exhaust, i hate tailpipes. i even dump quite mufflers.
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04-27-2010, 06:47 PM
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#11 |
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Registered User
Join Date: Jul 2007
Location: Ottawa Ontario Canada
Posts: 1,156
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Re: Dumping Exhaust Under Truck?
Warp the rims LOL - yeah, I don't think so.
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04-27-2010, 07:53 PM
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#12 |
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Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 22,064
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Re: Dumping Exhaust Under Truck?
I prefer full length tailpipes that are 'well placed'.
The noise level w/dumped exhaust is much worse in the cab (especially on older trucks that don't have the interior insulation/plastics to help isolate exterior sounds. I drove board member 'Jonboy's' truck back to his house after dropping it last weekend. We were forced to cut off the tail pipes of his newly installed 2.5" dual Flowmaster exhaust because the kick-up over the rearend housing was hitting solid. The truck was much louder & even on that short 20min drive, it got 'old' real fast..... As mentioned, it also kicks up a lot of dust/debris from the ground (if the truck is low enough) which can make the underside a mess as well as anything behind you (something to remember @ local cruises/car shows). I've always preferred the quiet vehicle that hauls arse vs. the loudest thing in the parking lot that's a stock motor w/dumped exhaust.
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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04-27-2010, 09:13 PM
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#13 | |
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Registered User
Join Date: Dec 2009
Location: Milton, FL
Posts: 733
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Re: Dumping Exhaust Under Truck?
Quote:
I cut it off about 6 inches behind the mufflers, ~8-10 inches in front of the rear end. It doesn't sound bad, but it lost a lot of the rasp it had to it with full tail pipes and its REAL bassy @ idle. Not sure how I like it, gonna try some turndowns and see how I like that. |
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04-28-2010, 04:43 PM
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#14 | |
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I know the pieces fit
Join Date: Nov 2007
Location: MONTGOMERY, AL
Posts: 5,523
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Re: Dumping Exhaust Under Truck?
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04-28-2010, 05:37 PM
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#15 | |
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Registered User
Join Date: Dec 2009
Location: Milton, FL
Posts: 733
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Re: Dumping Exhaust Under Truck?
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04-28-2010, 06:59 PM
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#16 |
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Registered User
Join Date: Apr 2010
Location: Memphis, tn
Posts: 65
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Re: Dumping Exhaust Under Truck?
First it won't hurt your rims it won't be that close.
Second I have run turn downs on 5 different vehicles and 3 of them were Tahoes. With a good muffler (50 series flow or magnaflow) cab noise is not that bad. I just installed a new cat and a magnaflow single in and dual out with 2 1/4" turndowns and I love the way it sounds but I don't like a loud exhaust. Mine rumbles at an idle and when it is going down the road it is not bad at all but it dumps right before my rear end and the turn downs are 30 degrees. there is my .02
__________________
Tim  87 Short Wide 305 TBI 700R4 86 Honda 350x (Resto Project Almost Complete) 07 Trailblazer SS (My Wife's Grocery Getter) 94 Camaro Z28 Last edited by tdiffee; 04-28-2010 at 07:59 PM. |
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04-29-2010, 04:36 PM
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#17 | |
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Registered User
Join Date: Mar 2010
Location: Hydro, OK
Posts: 89
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Re: Dumping Exhaust Under Truck?
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04-29-2010, 10:13 AM
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#18 | |
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I know the pieces fit
Join Date: Nov 2007
Location: MONTGOMERY, AL
Posts: 5,523
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Re: Dumping Exhaust Under Truck?
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04-28-2010, 07:03 PM
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#19 | |
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Chevys Kick A$$
Join Date: Jan 2005
Location: Zootown, MT
Posts: 12,699
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Re: Dumping Exhaust Under Truck?
Quote:
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*HOODS is what I answer too* -'79, '77, '88 Pickup Sold, '85 Camaro, '83 T/A, '81,'83,'90 K5 Blazer All Sold  -'79 3/4 ton "Big Yellow Bananna" Lifted 4spd. 39.5 TSL Swampers, The money Pit -'86 K5 Blazer Silverado 6.2 4" lift 35"s -'95 Ext. Cab Shorty 4" Tuff Country rolling 35" M/T's -'83 Monte Carlo T-Tops. 126,500 Original Miles -LATER  I would rather push a Chevy then drive a ford!!
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04-28-2010, 07:44 PM
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#20 |
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Registered User
Join Date: Mar 2010
Location: Kentucky
Posts: 32
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Re: Dumping Exhaust Under Truck?
Mines dumped right behind mufflers 3inch inlet and outlet.
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04-28-2010, 05:05 PM
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#21 |
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Registered User
Join Date: Jun 2009
Location: Conroe, TX
Posts: 86
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Re: Dumping Exhaust Under Truck?
Ive driven a friend's truck w/ the turn downs right after the muffler, it was a newer gmc (like 03).. but its a z71 so it sits up higher than these trucks.. i think it sounds kool and it does drone at constant speeds but it never gets annoying
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04-28-2010, 07:44 PM
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#22 |
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Registered User
Join Date: Dec 2009
Location: Milton, FL
Posts: 733
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Re: Dumping Exhaust Under Truck?
Haha thanks guys, put some turndowns on today, im still not completely happy, still think I want it out in front of the tires.
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04-29-2010, 08:43 AM
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#24 |
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Registered User
Join Date: Mar 2010
Location: Kentucky
Posts: 32
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Re: Dumping Exhaust Under Truck?
Flowmasters not sure which ones they were put on truck 10yrs ago it had been parked until 2 months ago when i started my rework on it.
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04-29-2010, 02:11 PM
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#25 |
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Registered User
Join Date: Jul 2007
Location: Tucson, AZ
Posts: 3,189
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Re: Dumping Exhaust Under Truck?
My duals are dumped behind the rear axle and out the side. I added stainless turn downs to keep the exhaust carbon off the fenders. I have a dump box, so my exhaust must exit well short of the rear bumper, or the exhaust tips will be knocked off when the box is in the full up position.
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