You're friend really needs to get that thing tuned. He will pick up aton more power and get way better gas milage. A tune is very important with long tubes. He will get way better gas milage too. Did he pull his o2s?
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224/228 Cam
Ported/Milled LS2 Heads 11.4:1
Ported F.A.S.T. Intake
F55 Magnetic Suspension
NPP Dual Mode Exaust w/ X-Pipe
Callaway Honker CAI
LG Longtube Headers
Bridgestone RE-11s
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