just installed, cleaned/lubed, guestimated 1/4th inch and started up, no problems, no stalls, no backfires, sounds OUTSTANDING. this is the exact sound i could have hoped for, i was leaking SOOOOOOOOO much boost i cant beleive it. i thought it was my spark plugs (gonna replace them anyway) but its now really smooth, no shutter either during acceleration depression. I scared the crap out of an SVT F150 hot rodding around my town, we pulled to a stop light inside a tunnel, in his american flag bandana he looked at me reved up which was very very loud so i waited until the resonance was gone, did one big VEEERRPASH! and this guy flinched sooooo classically. ultimately making my purchase worth it all. i made my left, he went straight, i drove away with an ear to ear smile. wont have any heavy driving impressions until the ECU learns how to live again. gimmie 2 days.