sorry for the late feedback.
Im still waiting for the shop to send me the file"dyne".
what i have done on my car is gen3, z1 hfc, and invidia cat back.
I dont really hear any rasp. my car was really quiet with the invidia. but hfc just made it sound like more of a growl?
it took them about 1:30min. and it costed me 600 with up rev and dyno tune.
Im really really happy and happy that i did what i did.
car is definitely much more smoother, and you know that lag when gassing in first gear? gone!
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