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I'd keep the NPP over the flowmaster. I have the same catback and my buddy has a '13 with NPP. I love the flowmaster sound but the NPP sounds awesome and fits better.
I don't think you'll be able to use the x-pipe, the stock exhaust is 2.5" and my American thunder is 3", assuming yours is too. A exhaust shop could make it work but i'm not sure it's worth the effort.
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2010 2SS
BMR 1" Springs
Koni Orange struts/shocks
1LE rear sway bar
SRP Racing Pedals
Hurst Billet short shifter
Square tire/wheel setup
Elite Engineering Catch Can
Stainless Power longtubes/highflow cats
K&N Typhoon CAI
RPM Motorsports of Garner, NC dyno tune (421 RWHP)
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