Hello, well I have a 2016 st, I've added the Mbrp catback exhaust and the roush cold air intake, I'm wanting to add the 3 inch catted downpipe next but I've read somewhere that it might run rich after this mod. So should I go tuner first? Or would I be ok doing the downpipe first? Any insight from more experienced members would be greatly appreciated.
1.7 MB Views: 254