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Start with free OE front pipe and guage what the sound levels are and then replace. Honestly I would just keep stock front pipe as you want one cat. Till you get to the 350-400whp range will the stock exhaust become an issue. Your already replacing the biggest restriction in the header and overpipe with the ace 350 combo.
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2013 Series 10 FRS #553
RCE T2's, SPC LCAs -4/2.6 camber
JDL 4-2-1 EL, FP and OP, Tuned by Zach@CSG on e85
RR Wilwood Front/Rear Sport BBK, Motul 600 Fluid
ARC-8 17x9 SX2 GTs 245s/Koing 17x8 v730's 225's
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