Si Misfire/breaking up

[Lucas10thgensociety]

Recently got a Catless downpipe installed after a few days noticed the car hesitates/misfires under a load of boost, (starts to break up or sputter during acceleration at 15-20psi or any load really), tightened my downpipe bolts again today, thinking it was a boost leak but still having the same issue. anyone have this problem?

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[blacklion703]

I had this issue. endued up being 2 loose spark plugs.

 

[Lucas10thgensociety]

Thanks a lot much appreciated going to check this out

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