i'm reading a thread on the GT-R forum and i realize some people just simply have money and no car knowledge lol
this guy bought a 17 GTR, just put a full 4" straight pipe system on and kept stock downpipes to keep stock tune. this is completely doable.
he's in a panic because after he did 100 miles to get the ECU relearn he went WOT and got 2 backfires/pops at 5500/6000RPM........