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Exhaust diameter

So I have searched for awhile now and can’t find an answer. Wanted to see if anyone could help. I have had beluga test pipes on for about 4 months

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		Nissan 370Z Forum > Nissan 370Z Tech Area > Engine & Drivetrain > Intake/Exhaust
Exhaust diameter

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01-08-2018, 10:19 PM	#1 (permalink)
Fhjkalfhu Base Member Join Date: Feb 2017 Location: Somewhere Posts: 114 Drives: 2009 base white 7AT Rep Power: 10	Exhaust diameter So I have searched for awhile now and can’t find an answer. Wanted to see if anyone could help. I have had beluga test pipes on for about 4 months now, and I’m getting tired of the fumes. So I decided to get HFCs, but noticed the z1’s are 2.5” outlet. I know my catback exhaust has a 2.25” diameter and I started thinking maybe I’m having more fumes or a leak because my test pipes are also 2.5” and found out they were. So my question is, is it bad to hookup a 2.25” catback to a 2.5” hfc/tp? Does it cause any problems at all? Not_Z_but_G likes this.

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