Have mivv race can with db killer it's a 35mm outlet...tried today without db and its a 60mm straight through pipe!!. Now I like loud pipes but this is just about on the ott range... Does anyone knowbif it's ok to run with db killer on race map!.....or I could reconnect the flap but can't remember if this is closed until 1st gear is engaged? This might help as and pc plods I could coast in neutral...lol.