So I installed the Agency P Xpipe & muffler pipes on the 991, did 2 tests..
#16
No worries about the check light, just be sure to cap off the vacuum line (if you have a vacuum line). Wavy idle seems to have gone away now, guess the ecu figured it out. I still like it, sounds awesome, I'd be seriously bored if I didn't have the x-pipe on the 991. I think its a must.
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