Join Date: Apr 2018
Location: SW New Hampshire, USA
Mentioned: 27 Post(s)
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Quoted: 1243 Post(s)
If the cat is bad it should pop a CEL. Any codes? You do have a code reader? Not being turbocharged going to high flo downpipes won't make a big difference.
Don't be wasted $ on parts you may not need. The cats should be covered if your mileage is low enough being EPA emission control parts. IIRC
2018 AWD Q50 RS, Graphite Shadow, NO DAS, 255/40ZR19, Pilot Sport 4S, Stillen rear Anti-sway Bar on stiffest, AMS HE, Fast Intentions high flo cats, resonated X-pipe & CBE, VS Forged VS02 19"x9" +33 Slate Gray rims (20 lbs), AMS Intake, Z1 LSD, IPL badge, AMS badge, AMS expansion tank, EcuTek remote tune from Seb at Specialty-Z, Z1 HKS BOVs, AP Racing BBK Radi-Cal II calipers & J hook 2 piece rotors, SS lines, DOT 4, Level 10 Torque converter & transmission