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Old 02-20-2013, 06:26 PM   #15
Drives: 2013 ZL1 Black M6
Join Date: Dec 2012
Location: Pearl River, NY
Posts: 280
I always just assumed that the bigger the diameter the better... Do the stepped headers really make more power?
2013 Camaro ZL1 #1440 Black M6, Roto Fab CAI, Kooks LT. JRE Cam Package, 9.55 Lower pulley, MSD BAP, Dual Pass HX, 652RWHP 613RWTQ
2012 Triumph Speed Triple, Muffler delete, tune
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