I had an exhaust shop weld this into the stock FP and remove the stock resonator but left the cat alone. Worked very well. Had a 4-2-1 header as well stock FP with mod, stock mid pipe and an axleback with good results
Vibrant 1140 2.25" Ultra Quiet...
https://www.amazon.com/dp/B000E3VHW8...p_mob_ap_share
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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