I will be selling my upgraded FMIC and will be putting stock on. is there gonna be a issue if I drive it on stock FMIC? I am tuned with a BBK FUll turbo

 

Normally a upgraded cooler will allow you to run more timing as its more efficient in cooling. So I would have to say... YES, it would not be a wise choice to drive the hell out of your car with a tune which was made for an upgraded cooler.

 

How much boost have you been running up until now through your upgraded front mount? Are you running the car on straight 91 octane pump gas? Who tuned your car? What form of boost control are you employing? Who tunes your car?