I had that issue when I installed mine aswell... Wasnt sure on how to fix the issue either and tried several things... Did you also remove your Evap Shield?
Plus dont plan on putting Test pipes on it because it will have a very very high Whistle howl noise that comes from the increased exhaust flow in the X pipe. This was the reason I switched to HKS.. But I did talk to ARK and they said they were designing a HFC that wouldnt make that noise and increase flow..
Good Luck!
DAN
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-My BRZ with exhaust will decimate all if we overnight parts from Japan-
10 Civic EX Sedan- Current Daily
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