I had a check engine light as well but it was due to the tune. Once Marc at STS sent me few new tunes the issue was solved but with the shady install of my system I have two exhaust leaks currently. I'm having my new tuner change out the clamps for flange connections and he is also going to move the AFR "sniffer" where it belongs...AFTER THE TURBO. Also gonna push 9-10 psi on the system to see what it can handle (with the meth injection system).
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