I have a stock L82 and went with true duals 2 1/4" H-pipe and Flowmaster 50's 
. 2 1/4" is better then 2 1/2" for a stock motor...
78 exhaust question
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Instructor
Joined: Jan 2004
Posts: 242
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From: Manchester Mi
78 exhaust question
since I am having my car re-built due to an accident last fall, I decided to have true dual exhaust installed (less the cat) 2 1/2 in. Dyna-flow mufflers. Do I need an H pipe or run them both back seperate to mufflers?
Thanks
Thanks
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Joined: Nov 2003
Posts: 86
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From: RI
either or would work fine with the h pipe you will get alittle more low end power. Also it will smooth out the exhust tone and quiet it down alittle. In my opinion also if you have a stock engine and are not going to do any major mods i would go with the 2 1/4 inch exhust instead. the 2 1.2 might flow too well.
rj
rj
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Joined: Feb 2005
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i have a '78 and opened it up to a true dual, i got about 30hp increase, and it was noticibly faster. I dont have an h-pipe althought people have reccomended that i either make or buy one because it gives you more horses/torque in the lower rpm. So if you had the option to do it now, i would go with the H-pipe.
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Melting Slicks
Joined: Feb 2003
Posts: 2,330
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From: Long Island NY
Stock was 2 1/4" but that was with a 'Y' pipe, when you go to true duals you are adding about 6' of pipe, thats the difference...that's why 2 1/4" is better for close to stock engines...
Pro
Joined: May 2004
Posts: 712
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From: caraquet N.B Canada
That's what i have on my '78 L82, 2½" pipe with no cat and '80's dyno- max muflers.The '80's muflers are smaller and less restrective than the big round muflers. The sound is better. This year i bought a set of headers that i will put on this spring.
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Joined: Feb 2005
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Originally Posted by den(thevetteman)78
That's what i have on my '78 L82, 2½" pipe with no cat and '80's dyno- max muflers.The '80's muflers are smaller and less restrective than the big round muflers. The sound is better. This year i bought a set of headers that i will put on this spring.
i did that exact setup except that i used 60s i think. I also got some chrome ceramic headers that im putting on in the next few days, along with changing out my motor mounts from fubber to urathane.