I just installed a Summit cutout in place of the cat. Geez...this thing is window rattling loud. It will be great at the track, but I'm wondering if anyone has made a plate with a hole in it to be able to run partially open on the street? I'm not sure what size hole to start with. What size hole is in the largest Borla adjustable plate?

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'87 Formula WS6 - ZZ4 Crate TPI, ported heads, LT4 hot cam, 1.6RR, Accel runners, Accel lower, ported plenum, Edelbrock 58mm TB, pulleys, SLP cold air, headers and full exhaust, !cat, exhaust cutout, Walbro 255, Koni yellows, aftermarket panhard & LCA's.

 

I believe the largest is 1 to 1.5" but Im not 100% sure.

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1989 Trans Am GTA, 5.7L TPI, TH700-R4, T-Tops, dual cats, 9-bolt rear, 3.27, Dynomax muffler, K&N
1992 Camaro RS, 5.0L TBI, T-5, T-Tops, 3.08, L69 Dual Snorkel, K&N - Sold

 

Call borla, maybe they sell replacement pieces or go to a machine shop.

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-Tas
'89 Formula WS-6

305, TBI, auto, 14x3 chrome flat based open element with K&N, Milodon 160* thermo, functional Formula hood, cross-flow Flowmaster, '99z28 rear pipes and tips....

To be installed eventually far far far into the future: Yours if the price is right and I don't have to ship :
Hooker 1-5/8" 50 state legal headers, Dynomax 3" I pipe (PN 44063 and 43248), Catco 3" cat, and injector spacer.

Super GRK_Taz World
F-Body Dual Exaust
EFI & Intake Options
AOL IM: superGRtaz