Truck is a 2001. 5 6 spd with stock air box and true flow foam filter. I was curious as to what options there were to get stock turbo (hx35) to spool up more quickly. I have 4 inch exhaust and that coupled with the foam filter element seemed to help a decent amount, just curious if there were other things to try/think about to improve this some more. Seems a buddy's truck spools up very quickly. He has a uni filter plumbed like a BHAF and a Mad ECM. Didn't know if these were the reasons his spooled so quickly or if it had to do with his auto trans.