I have the banks intercooler and 3.5" tubes on mine as well. Definitely lowered EGT's while cruising and towing. I don't feel that mine is laggy at all on the bottom end, may e its just my tuning. I wouldn't say it spools up faster either. I would say its the same as the stock intercooler tubes as far as spool up but lower EGT's so ill take that. Can definitely notice a difference in EGT's when your working the truck, whether it be towing, pulling, or just having fun with it.