Hey Guys

I just installed a VF28 STi turbo onto my MY99 wrx. Also installed a new exhaust as the old 3 inch was rusted out. While installing this I also put a new genuine O2 sensor. Since installing the VF28 my car stutters on boost. The idle is smooth, not erratic at all. No different to before the install but as soon as I hit boost the stuttering occurs. What are peoples thoughts..?


Cheers

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MY06 STi