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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 12-14-2006, 09:50 PM   #1
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Default DP for the Bonnie

Any thoughts on how much a down pipe would help the performance of a Bonnie. We don't have the same issues as the GP with the U-bend so I am pondering the increase in a cost/benifit analysis for a DP.
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Old 12-14-2006, 09:56 PM   #2
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http://hoganperformance.com/DP8S.htm

Quote:
409 Stainless Steel $ 139.95

This downpipe was developed to increase exhaust flow in the most restrictive area of the exhaust on the 97-03 Bonneville with a 3.8 SC and 3800 NA engine.

This pipe was installed on one of our clients cars recently. Dyno pulls were performed before and after the install with a 10-11 H.P. increase. The Dyno Sheet shows 2 pulls blue and red before and 2 pulls green and purple after.

Key Benefits
409 Stainless Steel mandrel bent tubing
Stainless steel flex coupler
Custom Cut 3/8 inch thick steel flanges
True bolt on with simple hand tools
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Old 12-14-2006, 10:32 PM   #3
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I love that they did two pulls for each. Smart guys over there.
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Old 12-15-2006, 08:41 PM   #4
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Quote:
Originally Posted by willwren
I love that they did two pulls for each. Smart guys over there.
That was my car. Curt is a great guy to deal with.
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Old 12-15-2006, 09:23 PM   #5
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I'm kind of confused... I thought you'd be putting down a lot more power at the wheels than that (243). Isn't 190-5 stock?
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Old 12-15-2006, 10:53 PM   #6
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Quote:
Originally Posted by dillcc
I'm kind of confused... I thought you'd be putting down a lot more power at the wheels than that (243). Isn't 190-5 stock?
IIRC, those pulls were taken a few mods back. Early last year I believe.

Those #'* are about what I'd like to see with my car as it will be next weekend.
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Old 12-16-2006, 12:44 AM   #7
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Quote:
Originally Posted by dillcc
I'm kind of confused... I thought you'd be putting down a lot more power at the wheels than that (243). Isn't 190-5 stock?
LOL...yeah...OLBlueEyesBonne is right...that was last year. Mods at the time were: FWI, 3.3 pulley, VS Cam, and PEMs.
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