If you want to stay quiet & pass emissions then you will want to keep your stock cats.
So that means no high flow cats, no test pipes, etc..
You didn't mention the type of car that you have, but im going to assume base or sport 370z.
Intakes yield good gains. K&N dropins + MAF Tubes = 16whp compared to Stillen g3s 18whp
QUIETER EXHAUSTS with gains:
Fast Intentions 18" Resonator
Stilen Catback
CNT Catback
Nismo Exhaust
Do some searching on here buddy...
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2009 Brilliant Silver BASE 7AT | TEIN S-Tech Springs | K&N Drop Ins & z1 Maf Tubes | AAM S-Line Short Tails | 5% Tint | 20MM Spacers | Sport Spoiler NickTurnon's 370z Build
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