If everything is tight and there is no leak, I would havet to think its the MAF or if its the ETI version it might be messing with the stock ECU to the point its cutting throttle and timing to prevent damage. I would take it to PX or SP and see if they notice anything with UPREV software or a Wideband.
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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