Hey all! I have an 87 325i (M20). I had it running amazing. Started up great too. Well, I couldn't pass smog so I had the catalytic converter changed. After this I am now having surges after the car is started, rough idle, bad starting. The cat swap required some changes to have it fit. Went from a 2 in 2 out, to a 1 in 2 out. The "Y" converter pipe is pre cat. Would this cause the issue? Any ideas?
Thanks!
Thanks!
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