3.0 inch vs 2.5 inch - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

GKevin61 · 10-28-2021, 02:36 PM

So I had ordered a Perrin 2.5 Catback exhaust back in July. After a few delays, it was set to ship towards the end of October. I just got word that it'll be delayed till January. I was looking to see if maybe I can find an alternative that I liked and it look like the 3.0 inch is available. Does anyone have experience with any of these, how much different would it be? Would there be any fitment issues with my front pipe? (Berk HighFlow 2.5 inch)

JD001 · 10-28-2021, 02:40 PM

Not much in it.. about half an inch..

CrowsFeast · 10-29-2021, 12:18 PM

Quote:

Originally Posted by GKevin61

So I had ordered a Perrin 2.5 Catback exhaust back in July. After a few delays, it was set to ship towards the end of October. I just got word that it'll be delayed till January. I was looking to see if maybe I can find an alternative that I liked and it look like the 3.0 inch is available. Does anyone have experience with any of these, how much different would it be? Would there be any fitment issues with my front pipe? (Berk HighFlow 2.5 inch)

Take this with a large grain of salt but I've *heard* that the 3" is a bit / possibly significantly louder. Makes sense to me as you've got 1.44x the cross sectional area.

Grady · 10-30-2021, 10:03 AM

I will have to agree. I had an AVO turbo with straight 2.5 in exhaust no cats. It was loud but no drone. When I transitioned to 3 inch I had to put a muffler back in the system.

jflogerzi · 10-30-2021, 12:59 PM

Don't do 3inch NA. You will regret it.

GKevin61 · 11-02-2021, 05:30 PM

Seems like I’ll be waiting another 2 months for my exhaust then.

nikitopo · 11-02-2021, 05:35 PM

Best option.

10-28-2021, 02:36 PM	#1
GKevin61 Junior Member Join Date: Oct 2021 Drives: 2013 White Subaru BRZ Location: Albuquerque, NM Posts: 5 Thanks: 0 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	3.0 inch vs 2.5 inch So I had ordered a Perrin 2.5 Catback exhaust back in July. After a few delays, it was set to ship towards the end of October. I just got word that it'll be delayed till January. I was looking to see if maybe I can find an alternative that I liked and it look like the 3.0 inch is available. Does anyone have experience with any of these, how much different would it be? Would there be any fitment issues with my front pipe? (Berk HighFlow 2.5 inch)

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10-28-2021, 02:40 PM	#2
JD001 Senior Member Join Date: Apr 2015 Drives: Subaru BRZ Location: UK Posts: 6,261 Thanks: 7,980 Thanked 6,500 Times in 3,638 Posts Mentioned: 26 Post(s) Tagged: 2 Thread(s)	Not much in it.. about half an inch..

11-02-2021, 05:30 PM	#6
GKevin61 Junior Member Join Date: Oct 2021 Drives: 2013 White Subaru BRZ Location: Albuquerque, NM Posts: 5 Thanks: 0 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Seems like I’ll be waiting another 2 months for my exhaust then.

11-02-2021, 05:35 PM	#7
nikitopo Senior Member Join Date: Mar 2014 Drives: '15 BRZ RA Location: Greece Posts: 3,787 Thanks: 2,417 Thanked 1,947 Times in 1,263 Posts Mentioned: 29 Post(s) Tagged: 0 Thread(s)	Best option.

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