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Re: SLP LM questions
Depends on future mods.
Maybe 10 RWHP gain with the cat-back. Which is pretty universal for catbacks.
I do not recommend the Loudmouth if you plan on running longtube headers in the future. Sounds good with stock manifolds, but not once flowing really well. Too much drone, and very raspy.
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1999 Pontiac Trans Am WS.6 #1747
Stock'ish'
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