Questions
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Junior User
Joined: Mar 2003
Posts: 66
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Questions
I went to talk to my exhaust guy and before I could get any answers he told me how much he disliked the sound of the 6's exhaust. So I have a few questions.
1.)a) Will I get a deep or wrapped over sound with Glasspacks?
b) How about with a performance muffler?
2.) Which would I gain more horsepower and/or torque from, a performance muffler (from Flowmaster or Dynomax) or a Glasspack or Cherry Bomb?
3.) Is the performance I gain from dualling it off worth the money I will spend on the extra pipe and muffler?
4.) Where can I find a header for my engine?
In case this helps, my engine is a '91 EFI with dual exhaust manifolds. Thanks for all your help.
1.)a) Will I get a deep or wrapped over sound with Glasspacks?
b) How about with a performance muffler?
2.) Which would I gain more horsepower and/or torque from, a performance muffler (from Flowmaster or Dynomax) or a Glasspack or Cherry Bomb?
3.) Is the performance I gain from dualling it off worth the money I will spend on the extra pipe and muffler?
4.) Where can I find a header for my engine?
In case this helps, my engine is a '91 EFI with dual exhaust manifolds. Thanks for all your help.
Senior User
Joined: Jan 2002
Posts: 492
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From: Spokane WA, USA
Questions
It's all a matter of opinion. I had a dual 2" exhaust system installed with short glasspacks- drove it around for the weekend- HATED IT! - All the rice burners were turning there heads wondering where the HOT rice burner car was at- Mine sounded just like two of them toghether. I finally had them put two Thrush-type mufflers on. Now it's partially annoying, but I can live with it. I should have just tried a Dynomax - I don't think you will gain much dualling it off, i would just put a less restrictive muffler on and a larger tail pipe. This 4.9L breaths like crap, - I went with dual because I am going to SBC vavles to open up some top end.
Post Fiend
Joined: Nov 2002
Posts: 9,987
Likes: 7
From: Memphis, TN
Questions
Going dual will affect the EFI, and it won't help on an I-6 that already has the dual manifolds. Read Project MPG - it tells how to get the most for your money.
Senior User
Joined: Feb 2003
Posts: 215
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From: The best is the U.S.
Questions
I beg to differ, my truck had a complete stock exhaust up until about 6 months ago. It is a '93 I6 EFI that had dual exhaust manifolds. The exhaust was completely removed right after the O2 sensor, then I had 2.25" pipe welded on to each of the remaining stock pipes, installed two flowmasters and brought it out in front of the rear wheels. The day it was done I crawled under it and checked the O2 sensor output while running, GOOD TO GO! Anyway that has been a few months ago and if I had it to do over I WOULD HAVE DONE IT THE DAY THAT I BOUGHT THE TRUCK! That has been the best modification to date that I have installed! The truck is more responsive and has more power. I am not someone who makes bogus claims, this REALLY helped my truck. As far as the sound goes I like it but it is very unique (think diesel/logging truck almost V8 sound with a little diesel). If you have further questions PM me, but my dual exhaust setup has helped me decide whether or not to go to a big block. I WILL BE KEEPING THE 300, THERE IS STILL HOPE. 
