Just go find activeaeros old posts. I don't recall which tires (drag radials at the most though). He did many 13.9s on a stock ITR. I've seen it happen.
The BRZ at a roll is slower than my gsr which means its even slower than my ITR.
You can't change just the cat, but I'm sure you knew that
You ever go to one of the ITR expos?
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-Dave
Track cars: 2013 Scion FRS, 1998 Acura Integra Type-R, 1993 Honda Civic Hatchback
DD: 2005 Acura TSX
Tow: 2022 F-450
Toys: 2001 Chevrolet Corvette Z06, 1993 Toyota MR2 Turbo, 1994 Toyota MR2 Turbo, 1991 Mitsubishi Galant VR-4
Parts: 2015 Subaru BRZ Limited, 2005 Acura TSX
Projects: 2013 Subaru BRZ Limited track car build
FS: 2004 GMC Sierra 2500 LT CCSB 8.1/Allison with 99k miles