I have one on my 70 Charger, 3-1/2" that I made myself along with the entire 3-1/2" exhaust to the mufflers then reduced down to 3" up over the axle thru the stock tips with the reducer cut off. I can't tell you if it makes any more power or not but I always get compliments on how good my car sounds & looks mostly stock.
1963 Belvedere 440 Max Wedge Tribute 1970 Charger R/T S.E. 440 Six Pack 1970 Challenger R/T, 528 Hemi 1970 Charger 500 S.E. 440 4 BBL 1970 Plymouth Road Runner 383 1974 Chrysler New Yorker 440 1996 2500 RAM 488 V-10 4X4 2004 3500 Dually Cummins 4x4 2012 Challenger R/T Classic.
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