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Old 07-15-2006, 05:51 PM   #1
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Default Advice for Exhaust

(1997 P. Bonneville SSE. NON-SC)

Looking to change the exhaust on it this weekend. I was wondering if i could add a thrush glass pack from the cat and run straight pipe back and split off with a T joint for the dual exhaust. Good for performance and a decent sound?

Thanks..
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Old 07-15-2006, 06:25 PM   #2
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Hmmm... that idea sounds vaguely familiar...

http://www.bonnevilleclub.com/forum/...ic.php?t=53939


Don't eliminate your stock resonator and the stock muffler with the Thrush. It'll be WAY too loud for you. Find a way to keep two silencing devices in the exhaust path, or make a custom setup to use two Thrush cherry bombs.

With my Magnaflow 4" round resonator plus the Thrush, I still think it'* a bit too loud. As soon as I can, I'll be replacing the Thrush with a Magnaflow single/dual muffler straight out the rear bumper.

Ultimately, it'* up to you. Play around with it and see what you can come up with.
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Old 07-15-2006, 06:27 PM   #3
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Keep in mind that if you open that exhaust up too much, you'll lose off-the-line low end performance (torque). And it doesn't take much to screw up.

Our exhaust is 2.5" mandrel bent stainless steel with very little restriction from the factory. Until you have a 13-second car on the strip, keep all your stock piping and only replace individual components with better-flowing similar components.
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Old 07-15-2006, 06:39 PM   #4
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Quote:
Originally Posted by willwren
Our exhaust is 2.5" mandrel bent stainless steel with very little restriction from the factory. Until you have a 13-second car on the strip, keep all your stock piping and only replace individual components with better-flowing similar components.
His exhaust should be 2.25", not 2.5" (unless I'm missing something). Also, my stock exhaust might not have been stainless steel. First of all it was rusty, and second of all we were able to weld on it without using argon.

I will agree that the exhaust shouldn't be opened up very much unless you've done some major engine modding, but you could still do a 2.25" straight shot if you want to. It would surely flow better than the stock setup.
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Old 07-15-2006, 06:48 PM   #5
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92-95 SSE'* were 2.5". Not sure about newer.

My 95 supercharged SLE has 2.25", and I don't think it'* holding me back.
My 93 SSEi exhaust was carefully planned to not rob me of low end, while giving me more top end.
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Old 07-15-2006, 07:06 PM   #6
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The stock setup we took off of Ben'* car was a 2.5" to the resonator, and 2.25" after that.

*edit*

The downpipe is a 2.25" inner diameter with a sleeve in it.
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Old 07-15-2006, 07:28 PM   #7
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I have cat, resonator, and replaced the muffler with a Cherry Bomb Glasspack 2 1/4", I felt a little more power at take off but as you wear the sucker in, its gradually gets louder and louder, my friend has the same one on his 88 Cutlass and the red paint is just about to come off from the heat, and its extremely loud. I find that it has a very nice growl at low throttle, but as you get to 2000RPM'* its a deep thundering sound, the down side of that is people think you have a slow *** car because it sounds like its at WOT and you aren't going that fast.
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Old 07-15-2006, 11:22 PM   #8
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Thanks for all the advice guys. i just added an Airflow muffler, 3" coming in and dual 2.5"* coming out. Sounds nice at idle but like the last guy said at about 2.5 rpms its got that thunderous growl at low speed. But once you hit about 4 grand it sounds great.
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Old 07-15-2006, 11:46 PM   #9
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Why don't you get a muffler with the correct inlet diameter?
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Old 07-16-2006, 11:12 AM   #10
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Quote:
Originally Posted by willwren
Why don't you get a muffler with the correct inlet diameter?
I agree. Not saying you did anything "wrong", but your current setup is not for ideal performance. Unless you've done a ton of work to your motor, a 3" exhaust on an L36 is overkill. Even worse is the fact that you've got it bottlenecking from 3" down to 2.5". My recommendation for your car is a stock downpipe into 2.25" tubing in whatever configuration you like. I would use 2.5" max diameter at any given point in your exhaust. Preferably, you want to have a "small to large" setup, as opposed to a "large to small" configuration. This will allow the exhaust gases to flow at higher velocity in the smaller section, then as the pipe diameter gets larger the gases will already be cooling off and need less of that velocity. Did that make any sense?

If you're happy with the sound and performance, don't worry about changing anything. However, if you want the best exhaust flow, you might want to swap out a couple parts.
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