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I saw 7whp 20ft lbs with a catback. That was likely mostly muffler. I would say the MP units likely give little hp, within variance in dyno runs, say 2-3whp.
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'98 Dinan/RMS stage 2+(VAC cams, CES Cutring etc)
'15 Buick Regal "T"(wife)
'06 Saab 9-5 Combi 5mt (full suspension, LSD, clipped turbo etc) |