Not Ranked
i am replacing the muffs on a superformance two grand if done well . first 10 to 15 hp. lost at the colector; it must be blended with grinder and re tigged. second back presure is bull. if you have a heat sensor gun point it at your side pipes at the point of the biggest heat drop thats it you could cut your pipe off and it would be perf. i have done this on drag cars and it is all good . but this is just my opinion ie new member.
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