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Old 01-25-2003, 05:31 PM   #1
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Default Cat back exhaust?

Where do you guys find the Cat Back system for the 1995 Bonnys
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Old 01-25-2003, 05:51 PM   #2
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There isn't one yet, and the GP exhaust kits won't fit. Contact [email protected] for any exhaust options.
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Old 01-25-2003, 08:56 PM   #3
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Just contact me and I can give you more information about the cat-back systems I plan to produce for 92-99 Bonneville'* at least.
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Old 01-26-2003, 03:19 PM   #4
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Default Cat - Back Exhaust.

Hector...

Thanks for the input.

I found that Cole muffler and a couple of other local shops will build a complete dual system for me. I have to talk with them on the price yey. I'll let everyone know when I get it.

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Old 01-26-2003, 04:12 PM   #5
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Dual is a bad idea. Waste of money on the 3800. Talk to Hector before you waste any money for now performance.
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Old 01-27-2003, 11:48 AM   #6
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Default Cat Back Or Dual

Hector,

Why would dual exhaust be a waste of money??

More breathing less restriction..... etc.

Salmanman
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Old 01-27-2003, 12:43 PM   #7
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Not enought back pressure for your low end so you will lose performance in the low end of your ride and spend more money.

If you decide to do this you should spend more and get a dule turbo added a small one for the low end and a medium or large for the higher end.
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Old 01-27-2003, 01:19 PM   #8
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Bingo, Phantom. Right on the money. I can't recall a single Bonneville that went dual for these reasons. If you're modding the hell out of the car, go single 3" with dual outlets if you want. Otherwise, stay 2.5". Backpressure is your friend, to a certain extent.
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Old 01-27-2003, 10:39 PM   #9
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Default Re: Cat Back Or Dual

Quote:
Originally Posted by salmanman
Hector,
Why would dual exhaust be a waste of money??
More breathing less restriction..... etc.
Salmanman

Are you talking about having a seperate pipe for the front exhaust manifold and another seperate one for the rear exhaust manifold? Basically true dual exhaust, or from the cat split it into two pipes. Either way its a bad idea. You can do a 2.5" (for N/A) or a 3" (*/C) and use a muffler that will split it forn a single into a dual if you have an SSE/SSEi which has the cutouts in the rear valence for tips. If you dont have the cutouts, I suggest a single pipe and single in/out muffler.

But I need to ask a few more questions to help you. What model of Bonneville to you have? What are your other plans for power? Are you all about performance or sound as well?

I run a 3" catback right now but I have other custom modifications on my car that makes up for the low end torque and I am doing certain and enough modifications to justify that. I use a magnaflow muffler. I am currently designing a catback system for Bonneville'* but demand seems low, I am still deciding on whether or not to produce it.
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Old 01-27-2003, 11:01 PM   #10
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Quote:
Originally Posted by Phantom
Not enought back pressure for your low end so you will lose performance in the low end of your ride and spend more money.

If you decide to do this you should spend more and get a dual turbo added a small one for the low end and a medium or large for the higher end.

I dont suggest a dual turbo. I am going to assume you are referring to ones like the RX-7 twin turbo which is sequential in which the smaller ones spools up then the larger joins in later. Same with the Supra Twin Turbo and 3000GT VR4. A Dual turbo on the 3.8L would be neat, but would be too comlicated for the money and power. The reason those other cars have sequential is because not on boost, they are just driving 3.0L engines which is a drag especially with low compression. We have 3.8L and torque because we are pushrod as well as the design of our heads leads to lots of backpressure and torque with it. All you would need is a equential in which the smaller ones spools up then the larger joins in later. Same with the Supra Twin Turbo and 3000GT VR4. A Dual turbo on the 3.8L would be neat, but would be too comlicated for the money and power. The reason those other cars have sequential is because not on boost, they are just driving 3.0L engines which is a drag especially with low compression. We have 3.8L and torque because we are pushrod as well as the design of our heads leads to lots of backpressure and torque with it. All you would need is a single turbo so you can spool it up faster and rely on the N/A torque to get the car moving in the first place. Plus to do sequential you need a computer to control both, like when he first/second come on, how much, etc etc. Not worth the money for the power. Much easier and can spool a single turbo much much faster. I have already sized them for our cars since I will eventually just rebuild my engine with L67ish guts and cram 15-20psi of boost once I have 1 or 2 of my other engines built up.
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