Results of CGT Exhaust Experiment

[David]

While it IS loud, it is still nothing compared to the r1ce-boy exhausts around here. I would compare the sound level to that of a stock Mustang 5.0 or maybe a 5.0 with flowmasters... And I do intend on queting it down in the future. My plan is: cat...2.5" piping...glasspack...2.5" piping...high-flow rear muffler...2.5" piping...single or dual tips. Hopefully this will allow me to keep the tone but reduce the levels.

Dave
1987 CGT Special Build 2.3
SE Virginia

> From: JShadzi at aol.com
> Date: 2003/05/13 Tue PM 12:12:15 EDT
> To: duandcc_forums at cox.net (David),  quattro at audifans.com
> Subject: Re: Results of CGT Exhaust Experiment
>
> Hey David, though you say the results are fantastic, we need to quality your experience.  I'd say for 95% of the people out there your car is waayy too loud, one glasspack isn't much quieter than a straight pipe.  I will get you a ticket in most cities, especially in CA.  Throw an additional striaght thru muffler like a Borla or similar and you'll probably be in the ball park of what most would consider reasonable.  The NA car are just loud, on my 80tq its quite civilized with only one 3" Borla on it (and a 3" cat), I actually wish it was louder sometimes, but still its not quiet by any means.
>
> Javad
> 80tq.com
>
> >Patient: 1987.5 CGT (NG engine otherwise stock). Proceidure: Cut out bad center muffer, replace with traditional glasspack. The rear muffler was already removed and replaced with pipe a while back. So now the only silencer is a glasspack.
> >
> >Results: FANTASTIC! Nice LOW rumble under 3,000 RPM, sounds like a screaming banche at higher RPMs at WOT. At highway cruising speeds, it is only somewhat intrusive, but not to the point of annoying me or people in surrounding cars. I did make a guy in a 5.0 look over to see what the noise was (was reving out at WOT). Also I noticed that the engine seems more willing to rev out. Before there seemed to be no real reason to rev past 5,000 RPMs. The engine just didn't seem to make any more power, just noise, beyond that point. Now, it revs much easier and seems to actually be making power up to 6,000 (have never pushed it past 6,000).
> >
> >The tone is perfect IMHO, but I would ultimately like to find a way to keep the same tone but lower the decibles. This exhaust project was "temporary" as I'm quite sure the whole system will need replacing in the next 6 months. The long term plan is to do a 2.5" cat back system, with glasspack AND rear muffler. I would think that by having the glasspack as the "resonator" and a traditional (high-flow?) rear muffer I should be able to keep the tone about the same, just quieter. Or at least that's what I hope will happen. Anybody care to comment on my plan?
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