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Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 06-30-2007, 10:43 PM   #21
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How about exhaust? Has anyone mentioned a higher-flow exhaust system yet? Or does the car already have one? If not (and if not previously mentioned) then that would be the next thing on my list.
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Old 06-30-2007, 10:58 PM   #22
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You don't outgrow our outflow your exhuast until you hit the 13 second mark. Other than headers or PEM'*, which would be dictated by rockers or a cam.
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Old 07-01-2007, 02:34 PM   #23
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Still can't hurt. The best thing to pair with an intake is a higher flow exhaust system.

Yea, you're sucking more air in... but it doesn't do as much good if you aren't pushing it out any faster.

Besides, isn't this listed as one of the first things to modify on your car in the TechInfo??
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Old 07-01-2007, 03:15 PM   #24
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A high flow cat may gain you 5hp or so. You won't outflow your piping or muffler for a LONG time.

Headers, DP, PEM'*, etc will be dictated by valvetrain mods. Our exhaust is very high quality mandrel bent stainless steel that flows quite well. It is not a limiting factor out of the factory, and takes some significant mods to dictate a change.
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Old 07-01-2007, 11:43 PM   #25
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Well a high flow cat sounds like a good upgrade, especially considering the cost of it.

I'd go for it, a good investment too. As mentioned in the TechInfo, willwren'* topic shows that once you have a 180 thermostat and have the car breathing better with a custom intake (even a gutted airbox), that the next step is usually a high-flow cat and / or muffler.

Here'* the topic, I think it helps give a nice overview too. Didn't know if anyone'* posted it yet... lol.

http://www.bonnevilleclub.com/forum/...e=article&k=91
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Old 07-02-2007, 12:34 AM   #26
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That'* a general article, giving you a rough idea how do start modding any car. Willwren is saying that this particular year Bonne doesn't have a restrictive exhaust system (except the manifolds and downpipe if you have certain engine mods.) Now if the car in question was a 97-03 Grand Prix or newer Bonnie with the U-bend, exhaust mods may be the first thing to suggest. It depends on the car.
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Old 07-02-2007, 01:50 AM   #27
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My bad... I thought it was for Bonnevilles in general... oops.

Don't know how I missed that one...
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Old 07-02-2007, 05:58 AM   #28
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is there a high flow cat that is easy bolt on and will still pass WI emmissions testing?
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Old 07-02-2007, 09:09 AM   #29
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You can search and find the magnaflow direct fit. However you can buy a universal magnaflow for about $50 and it will still pass.
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