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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.
 

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Get the car tuned with the down pipe. Those are the only two things you should have bought unless you wanted "exhaust noise"
 
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