Exhaust note - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**MikeB** · 08-30-2002, 09:29 AM

With everything else being equal, if you increase the tailpipe diameter, will the exhaust note get deeper? I'm using 2 1/4 pipes with DynoMax Super Hemi Turbos (what a name, huh?). From outside, there's too much of a cheesy rat-tat-tat sound on acceleration. I'm wondering if 2.5" tailpipes would change the tone. If not, I may try using some bullet-type race mufflers to knock the sound down a bit. Another option is some resonator exhaust tips, like those made by Hedman. What do you all think? Yeah, I know -- my 383 really needs a full 2.5" system.

Mike C · 08-30-2002, 02:04 PM

The larger diameter pipe/muffler will tone down the rat-a-tat-tat some, but first I would try a balance pipe if you don't have one.

kxmotox247 · 08-30-2002, 02:44 PM

Yeah...just like Mike C said. Try a balance pipe first. It's going to be a lot cheaper than replacing the whole exhaust system if it satisfies you.

**MikeB** · 09-08-2002, 12:25 PM

I have a balance pipe -- full 2 1/4".

dion · 09-08-2002, 12:39 PM

I have the same problem. I have the same set up as you but with Flowmasters and no H-Pipe. In a couple weeks I'm changing over to 2.5 pipes with the H-Pipe, hopefully that will work.

**smitty62** · 09-08-2002, 01:57 PM

I know that Flowmasters are the "in" muffler now, but I personally think they sound tinny --they're just loud. I suppose I'll get flamed, but there are better, deeper sounding mufflers out there--I won't mention a brand or some will think I'm selling them. Pipe size doesn't matter that much. Muffler size, length and style has much more to do with a good deep sound--also, long, large tips with a thick wall (16 ga.) helps. JMHO

**MikeB** · 09-08-2002, 02:01 PM

Smitty, what has worked best for you?

Dion, let me know how it turns out. Don't use anything less than the 70-series if you are looking for quiet. I once had the 50s with Delta Flow Technology and even they were loud.

Low68 · 09-08-2002, 02:36 PM

Borla mufflers sound real good. I may get some of those some day.
Low68

dion · 09-08-2002, 02:39 PM

I'm not really looking for "quiet" but more of a low rumble. I have the low rumble now at idle but on the highway it's more of a slpping kind of noise, that's what I'm trying to get rid of. I have the Flowmaster 40's on now.

autorecycler · 09-08-2002, 11:10 PM

Flow masters worked well on my 2nd generation comaro Any of you guys getting new exhaust, feel free to send your old one up to me!

08-30-2002, 09:29 AM	#1
MikeB Senior Member Join Date: Jul 2000 Location: North Texas Posts: 3,570	Exhaust note With everything else being equal, if you increase the tailpipe diameter, will the exhaust note get deeper? I'm using 2 1/4 pipes with DynoMax Super Hemi Turbos (what a name, huh?). From outside, there's too much of a cheesy rat-tat-tat sound on acceleration. I'm wondering if 2.5" tailpipes would change the tone. If not, I may try using some bullet-type race mufflers to knock the sound down a bit. Another option is some resonator exhaust tips, like those made by Hedman. What do you all think? Yeah, I know -- my 383 really needs a full 2.5" system. __________________ Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!

08-30-2002, 02:04 PM	#2
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,723	The larger diameter pipe/muffler will tone down the rat-a-tat-tat some, but first I would try a balance pipe if you don't have one. __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

08-30-2002, 02:44 PM	#3
kxmotox247 Senior Member Join Date: Jul 2002 Location: Champaign, IL Posts: 1,397	Yeah...just like Mike C said. Try a balance pipe first. It's going to be a lot cheaper than replacing the whole exhaust system if it satisfies you. __________________ Baby Blue's Build Thread: http://67-72chevytrucks.com/vboard/s...d.php?t=652776 Project 68's Build Thread: http://67-72chevytrucks.com/vboard/s...17#post8442117 www.stonecolumnclassics.com Email: Josh@stonecolumnclassics.com

09-08-2002, 12:25 PM	#4
MikeB Senior Member Join Date: Jul 2000 Location: North Texas Posts: 3,570	I have a balance pipe -- full 2 1/4". __________________ Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!

09-08-2002, 12:39 PM	#5
dion 72 Cheyenne Join Date: Oct 2001 Location: San Diego Posts: 2,086	I have the same problem. I have the same set up as you but with Flowmasters and no H-Pipe. In a couple weeks I'm changing over to 2.5 pipes with the H-Pipe, hopefully that will work. __________________ Burnout Idle 1972Cheyenne 1966/67Stouts

09-08-2002, 01:57 PM	#6
smitty62 Registered User Join Date: May 2002 Location: North Carolina Posts: 1,234	I know that Flowmasters are the "in" muffler now, but I personally think they sound tinny --they're just loud. I suppose I'll get flamed, but there are better, deeper sounding mufflers out there--I won't mention a brand or some will think I'm selling them. Pipe size doesn't matter that much. Muffler size, length and style has much more to do with a good deep sound--also, long, large tips with a thick wall (16 ga.) helps. JMHO __________________ Stepsides look like real trucks! Smitty

09-08-2002, 02:01 PM	#7
MikeB Senior Member Join Date: Jul 2000 Location: North Texas Posts: 3,570	Smitty, what has worked best for you? Dion, let me know how it turns out. Don't use anything less than the 70-series if you are looking for quiet. I once had the 50s with Delta Flow Technology and even they were loud. __________________ Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!

09-08-2002, 02:36 PM	#8
Low68 Registered User Join Date: May 2001 Location: Arizona Posts: 758	Borla mufflers sound real good. I may get some of those some day. Low68 __________________ Build Thread

09-08-2002, 02:39 PM	#9
dion 72 Cheyenne Join Date: Oct 2001 Location: San Diego Posts: 2,086	I'm not really looking for "quiet" but more of a low rumble. I have the low rumble now at idle but on the highway it's more of a slpping kind of noise, that's what I'm trying to get rid of. I have the Flowmaster 40's on now. __________________ Burnout Idle 1972Cheyenne 1966/67Stouts

09-08-2002, 11:10 PM	#10
autorecycler Recycler Join Date: Sep 2002 Location: Mill City Oregon Posts: 88	Flow masters worked well on my 2nd generation comaro Any of you guys getting new exhaust, feel free to send your old one up to me! __________________ 72 C20 with a 350. Previous owner swapped the 4 speed for a 700R4 auto. I'm retired and volunteer at state and national parks. I spend summers in Oregon. Found this truck for $800 and offered $600. Paid for it with $$ made from recycling bottles and cans. Oregon pays .05 per can/bottle. Now doing restification with recycled parts purchased with recycling $$.

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