Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB - View Single Post - Possible solution for mating 2.5" to 3" exhaust parts?

KoolBRZ · 06-09-2015, 12:41 PM

I have the cheap Ebay Top Speed Pro 1 2.5" overpipe. I've used Top Speed Pro 1 from front to back and it sounds just fine. I also have concerns about the thickness of the flange causing rubbing against the car. I have lots of clearance now though. I plan on leaving the header bolted up and loosening up both the front pipe and the overpipe to line everything up. This will also alter the resonance wave coming back from the overpipe flange, hopefully for the better, so I'll need to dial in my AVCS tables again. I'll try and get a before and after dyno as well, since I'm doing dyno pulls next Monday.
P.S. I won't be installing it this weekend, since I'm getting dyno pulls this Monday.

06-09-2015, 12:41 PM	#9
KoolBRZ Senior Member Join Date: May 2014 Drives: Silver 2013 BRZ Ltd Auto 45,000 mi Location: Vancouver, WA.USA Posts: 965 Thanks: 86 Thanked 452 Times in 278 Posts Mentioned: 60 Post(s)	I have the cheap Ebay Top Speed Pro 1 2.5" overpipe. I've used Top Speed Pro 1 from front to back and it sounds just fine. I also have concerns about the thickness of the flange causing rubbing against the car. I have lots of clearance now though. I plan on leaving the header bolted up and loosening up both the front pipe and the overpipe to line everything up. This will also alter the resonance wave coming back from the overpipe flange, hopefully for the better, so I'll need to dial in my AVCS tables again. I'll try and get a before and after dyno as well, since I'm doing dyno pulls next Monday. P.S. I won't be installing it this weekend, since I'm getting dyno pulls this Monday.