Thread: Cold Sunday Drive
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Old 01-15-2007, 10:18 PM
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Jake Jake is offline
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Join Date: Feb 2003
Location: Puyallup Wa., wa.
Cobra Make, Engine: Superformance Cobra #1628, Coast Performance Stroker 427W Ford 520HP/535FT.TQ, Blue with white stripes
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Tracy,
From the research I did it should add 50-70 HP. It may be half that or less with a small block. The problem on the stock SPF exhaust is the 2 inch inside diameter. I now have 3 inch and it sounds like a different car. It has a deeper throaty tone and is a bit louder....But still tolerable without ear plugs. For anyone in the Seattle area that has a SPF and wants the new mufflers added to stock pipes...Stay tuned. We are putting some prices together for the conversion of stock pipes. We also plan on doing some dyno tests to see what kind of real power we are getting. Besides the awsome exhaust note the new mufflers are cool enough to touch by hand after a hour run. You can not do that with the stock pipes. I have branded and sent a few friends to the hospital with the old ones. More to come!

Jake
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