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#1 |
Registered User
Join Date: Mar 2009
Location: NW, Colorado
Posts: 285
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Exhaust Pipe SIZE?
So I am running a pretty build 350. Has intakes, cam, worldproducts head, etc. The headers are flotechs with a 3" collector. I am running dual exhaust out the back and probably looking a super 40s, or the likes. But I am not sure if I should run 2 1/2 pipes etc. or 3"pipes.
I want a good throaty type of sound and have set the motor up for more low end power/pull. Just not sure what size to run out...
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#2 |
Registered User
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Location: Chattanooga TN
Posts: 6,208
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Re: Exhaust Pipe SIZE?
2.5 would be fine.. Just my opinion. Have you looked into an X pipe ? Talk about a wicked sound. Have you ever heard the old Sterling Marlin #4 Kodak Nascar from the late 90's ? .. I don't know how to describe it but it would sound very unique.
You'll lose a little off the line if you run 3" just from back pressure .. but 3" would out flow 2.5" on the higher rpm range. It just depends on your plans for it IMO.
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Chad 1967 C10 SWB - Project Savannah - 6.0/4L80 *Currently underway* 1968 C10 SWB - TOTY 2018, 50th Anniversary Tribute Project * Sold * Pride and Joy 1986 Silverado Short Fleet - Scarlet *Sold* 1985 Silverado Short Fleet *Sold* 2022 Jeep Gladiator Mojave 2001 Jeep Cherokee XJ 4x4 - Lifted, Built 1992 Jeep Cherokee XJ 4x4 - Lifted 2013 Honda Accord EX-L v6 Coupe 6spd (wife's ride) |
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#3 | |
Registered User
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Location: VA
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Re: Exhaust Pipe SIZE?
Quote:
I would like to recommend you look into Hooker Aerochamber Mufflers. They sound REALLY good. I have a set on my truck and I have 320HP and they sound BETTER then Flowcrappers.
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1968 SWB. GMPP 350/350 Turbo Trans, Edelbrock Performer & Carb. Hedman Hedders, Hooker Aerochambers Mufflers. Tuff Stuff Alternators. Remember, no matter where you go, There you are. Gary |
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#4 |
Registered User
Join Date: Jul 2007
Location: Fall River California
Posts: 2,026
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Re: Exhaust Pipe SIZE?
I can't help you with the performance end but I have flowmaster 40s on my truck with a stock 350 and 2.5" pipes and it sounds really nice, it's a very mechanical sound (if that makes any sense), it sounds like its got more of an engine than it does and I have people asking me all the time what I did to the engine.
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#5 |
Man of Mini-Talents
Join Date: Sep 2009
Location: Oklahoma City, OK
Posts: 4,295
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Re: Exhaust Pipe SIZE?
For low end, definitely 2-1/2.
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Steve Project - Ruth 66 Skylark Project - Lola 60 Biscayne Project - Iron Ox 54 GMC 100 Project - Darth 69 Camaro |
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#6 |
Proprietor of Dale's Corner
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Location: Vacaville , CA
Posts: 16,089
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Re: Exhaust Pipe SIZE?
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"Some Days Chickens And Some Days Feathers" Dale XNGH ECV Sam Brannan 1004 R.I.P. 67ChevyRedneck R.I.P. Grumpy Old Man |
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#7 |
Registered User
Join Date: Aug 2012
Location: Indiana
Posts: 470
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Re: Exhaust Pipe SIZE?
I HATE MY FLOWMASTER!! it costs almost as much as a borla for my dual in dual out thats on my 97 as a borla dual in dual out, and the flowmaster is always giving me headaches, and it seems to be getting louder, like its breaking down inside, and its only about 18 months old, and I drive almost 20 miles each way to work everyday so its not from too much moisture build up, borla and dynomax are my two favorites by far!!!
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70 C10 working on a LSx swap ![]() 4.8L MS3 edelbrock pro flo intake, pacesetter long tubes, 4l60e 2500 stall hoping the tranny holds up lol Last edited by 1970 C10 MJW; 02-14-2013 at 04:17 PM. Reason: clarifying my statement |
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#8 |
Registered User
Join Date: Jul 2007
Location: Fall River California
Posts: 2,026
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Re: Exhaust Pipe SIZE?
Do you guys know if an X or H pipe make any difference as far as perfomance, mileage or sound? I've heard mixed opinions and was wondering if I'll notice anything real?
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#9 |
Registered User
Join Date: Dec 2012
Location: TN
Posts: 31
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Re: Exhaust Pipe SIZE?
agree on the 2 1/2
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#10 |
Senior Member
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Location: Williamsburg, Ohio
Posts: 1,778
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Re: Exhaust Pipe SIZE?
I am sold on at least an H pipe. It evened out the sound thru the Flowmaster 50's. From what I hear a xover is even better. Guys on this forum suggested it to me to give a better more even sound and it did. I have 2 1/2 from short headers to the 50's in front of the axle with 2 1/2 inch back to the bumper. I welded in a 2" crossover at the end of my 208 transfer case --- it can be removed without dropping exhaust. if I redo will use a 2 1/2 inch H pipe but not sure it would make a diff. I run a 268 cam in my 350.
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#11 |
the boat guy
Join Date: Jul 2007
Location: springfield mo
Posts: 2,339
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I hope its fully built, they don't run very good when they are missing parts. Maybe trade one of those intakes for some connecting rods.
I prefer the sound of 3" myself. After having flowtech headers on my sbc I would recomend anything else they didn't even come close to fitting and the ceramic coating was so thin that they rusted within 6 months. Be sure to have the exhaust shop run the exhaust through the frame, you don't want that stuff hanging down. Posted via Mobile Device
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67, swb, fleet, tach, throttle, 5.3, 4l60e, 3.73's, fuel cell, 5 lug, p.d.b., 4-6 drop. great little truck 66, stevens drag/ski 18' silouette, 350, 2.02 doublehump heads. comp extreme marine 278 cam, vette 7 fin valve covers, old polished edelbrock intake, velvetdrive, casale v-drive, adj cavitation plate. 28, model a rpu project, |
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#12 |
Senior Member
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Location: New Madison, Ohio
Posts: 21,365
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Re: Exhaust Pipe SIZE?
2 1//2 is what I'm using with my 402
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A husband can be right...or...A husband can be happy. ![]() 67-72 Chevy and GMC Trucks...The Classic Truck for the Classic Folk. ![]() 1970 CST Two tone green, 402BB, 400 Automatic, Tach, Buckets, AC, AM-FM, Tilt, GM CB, GM 8 Tract, LWB, etc ![]() ![]() JOHN 17:3...The better side of "LIFE" Remember: Everyday is a good day...Some are just gooder! |
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#13 |
Registered User
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Location: Chattanooga TN
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Re: Exhaust Pipe SIZE?
Have you considered Magnaflow? Maybe some of the longer round ones?
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Chad 1967 C10 SWB - Project Savannah - 6.0/4L80 *Currently underway* 1968 C10 SWB - TOTY 2018, 50th Anniversary Tribute Project * Sold * Pride and Joy 1986 Silverado Short Fleet - Scarlet *Sold* 1985 Silverado Short Fleet *Sold* 2022 Jeep Gladiator Mojave 2001 Jeep Cherokee XJ 4x4 - Lifted, Built 1992 Jeep Cherokee XJ 4x4 - Lifted 2013 Honda Accord EX-L v6 Coupe 6spd (wife's ride) |
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#14 |
Registered User
Join Date: Jun 2012
Posts: 1,089
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Re: Exhaust Pipe SIZE?
I have Magnaflows on my 06 sounds better the flowmaster I put on it first go around.
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#15 |
Registered User
Join Date: Mar 2009
Location: independence mo
Posts: 2,111
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Re: Exhaust Pipe SIZE?
Everyone bags on flowmasters, I have headers, H-pipe and flowmaster 40's and I think my truck sounds good.
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#16 |
Registered User
Join Date: Mar 2012
Location: Leanna, TN
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Re: Exhaust Pipe SIZE?
383 stroker, shorty headers, 2.5 pipe into 3 inch JEGS mufflers with turndowns.
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#17 | |
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#18 |
Registered User
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Re: Exhaust Pipe SIZE?
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Chad 1967 C10 SWB - Project Savannah - 6.0/4L80 *Currently underway* 1968 C10 SWB - TOTY 2018, 50th Anniversary Tribute Project * Sold * Pride and Joy 1986 Silverado Short Fleet - Scarlet *Sold* 1985 Silverado Short Fleet *Sold* 2022 Jeep Gladiator Mojave 2001 Jeep Cherokee XJ 4x4 - Lifted, Built 1992 Jeep Cherokee XJ 4x4 - Lifted 2013 Honda Accord EX-L v6 Coupe 6spd (wife's ride) |
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#19 | |
///Relaxed Atmosphere
Join Date: May 2010
Location: Houston,Tx
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Re: Exhaust Pipe SIZE?
Quote:
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71-Cheyenne Super (E.C.E Static Drop 4.5/7". Intro Rally's 20X8.5 5" B.S 255/35/20 (F) 20X10 5.25 B.S 275/35/20 (R) 87-Silverado Static Drop 5/7" Raceline Explosion 5 22X8.5 (F) 22X10 (R) hector _________________________________ 1971 Chevrolet Cheyenne Super 1987 Chevrolet Silverado 2006 Ford Mustang GT 2012 Toyota 4-Runner 2014 Dodge Ram 1500 Sport Crew Cab |
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#20 |
Registered User
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Location: Chattanooga TN
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Re: Exhaust Pipe SIZE?
Cell phone ring tone maybe? Just the idle..
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Chad 1967 C10 SWB - Project Savannah - 6.0/4L80 *Currently underway* 1968 C10 SWB - TOTY 2018, 50th Anniversary Tribute Project * Sold * Pride and Joy 1986 Silverado Short Fleet - Scarlet *Sold* 1985 Silverado Short Fleet *Sold* 2022 Jeep Gladiator Mojave 2001 Jeep Cherokee XJ 4x4 - Lifted, Built 1992 Jeep Cherokee XJ 4x4 - Lifted 2013 Honda Accord EX-L v6 Coupe 6spd (wife's ride) |
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#21 |
Registered User
Join Date: Jan 2013
Location: Mickleton, NJ
Posts: 1,776
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Re: Exhaust Pipe SIZE?
I went 2-1/4 behind my 327. I have long tube headers, a short pipe to a Flow Tech muffler on each side, the the pipe turns out in front of the wheels. I'm about to add in some resonators to tone it down some. Has a good tone but just too loud in the cab.
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Shawn 1970 Chevy C-10 SWB, 350, TKO 600 5 speed My build http://67-72chevytrucks.com/vboard/s...d.php?t=559881 |
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#22 |
Cluster King
![]() Join Date: Nov 2012
Location: Junction City, OR
Posts: 5,263
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Re: Exhaust Pipe SIZE?
http://www.angelfire.com/my/fan/Exhaust_Pipe_Size.htm
There are many web sites with exhaust caculators and I attached one for you. As others have mentioned, to get optimum power, you need to consider back pressure. If your pipes are to big, it is like blowing air into a bag that has a hole in it, it does nothing. The 3 inch stuff looks and may even sound good but it kills low end throttle response. As the chart shows, 2 1/4 is the best for a dual with 400 hp. Also consider the price of the pipe as the bigger the ID the more it cost. |
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#23 | |
Senior Member
![]() Join Date: Feb 2001
Location: New Madison, Ohio
Posts: 21,365
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Re: Exhaust Pipe SIZE?
Quote:
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A husband can be right...or...A husband can be happy. ![]() 67-72 Chevy and GMC Trucks...The Classic Truck for the Classic Folk. ![]() 1970 CST Two tone green, 402BB, 400 Automatic, Tach, Buckets, AC, AM-FM, Tilt, GM CB, GM 8 Tract, LWB, etc ![]() ![]() JOHN 17:3...The better side of "LIFE" Remember: Everyday is a good day...Some are just gooder! |
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#24 |
Registered User
![]() Join Date: Oct 2012
Location: oran,mo.
Posts: 171
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Re: Exhaust Pipe SIZE?
2 1/4 is good to 400 hp, 2 1/2 is good to 500 hp, then you need to go 3", i put 2 1/2 pipes with stainless glass packs on my wifes with a 375 hp vortech head 350 and she won the rackoff contest, we did the same setup on our boys with 2 1/4s and it was pretty loud and sounded pretty good as well, now ive got 3" on mine with summit mufflers 30 degree bend with 4 1/2 stainless tips in front of my rear tires but it has a 580 hp 477 and im telling you its really loud, but it sure sounds good,
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