MY car sounds like Honda help !

Originally Posted by levani041491

so Guys I have a shop and I do my own work and buy, fix and sell Nissan/Infinitis from Copart and IAAI actions , I just did motor swap from my parts car g37 Sedan with 18k miles to Stillen Superchargered G37 with blown motor LOL . He had PPE headers , Y pipe and greddy catback and when I finished the motor swap and test drove it around, that car had no RASP at all and sounded like 2014 GTR I have in the shop .


I have
3 sets of extra OEM cats
2 sets of OEM y pipes
2 sets of Sedan Mid-pipes

i want to get rid of Rasp and need a advice where to start or I am just gonna put everything stock and changed part by part to just diagnose the source of RASP

MY 02 sensors went bad from vibration from using impact gun / Air chisle my worker used to remove stock exhaust without telling me, So 02 sensors unpluged car made 299.7 whp and 270wtq on dynp jet dyno

Stock intakes , stock tune , stock clutch just test pipes and exhaust