I am thinkimg about gutting the cat to get the exhaust a little louder. Any drivability problems after doing this? And what about the air tube? cut it off block it off or leave it alone?

 

No drivealbility problems at all. I just left the air tube in there. One of my friends told me that would probably get me better gas mileage, but I havent really checked, id imaine it would a little bit.

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89 camaro 305 tbi, flomaster 3 chamber cat back, gutted cat, Edlebrock TES Headers, Exhaust cutout, Edlebrock open element, and a 160 degree T-stat. 2 kicker comp 12"'s, polk for the rest. Phoenix gold xs2300 to subs, kicker impulse 404XI to 4 speakers, pioneer DEH- P7000R head unit, and finally a 12 disc changer. Full leather interior from http://www.MrMikes.com (its nice)

 

You should have no drive problems, but try and put some sort of pass through pipe in there. Otherwise you cause some bottleneck in the exhaust. The AIR stuff is up to you, if you don't have emissions in your area, get rid of them, the smog pump, belt, and divertor valve. Some people say you might need a heated o2 sensor if you gut the cat, you'll have to make sure you are still going into closed loop otherwise you might need one. Good luck.

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87 GTA 350 L98
K&N filters, beefed up TH-700r4, Accel Manifold, Ported Plenum and Runners, Fuel Press. Regulator 49.5psi, air foil, modified MAF, SLP cold air box, Hypertech Thermomaster chip w/160 thermostat, MSD 6AL and Blaster 3, B&M shift kit & megashifter, Moser Ford 9in Rear with Richmond 3.50 and locker, Edlebrock TES headers and Cat Back,Hotchkis setup in rear, Poly suspension and Koni in the front, relocated MAT, bypassed TB coolant, 300 lbs lighter

Fastest ET's
Stock-0-60 6.8, 1/4 15.0 @ 94
Best-0-60 4.7, 1/4 12.8 @ 112
Norm-0-60 5.2, 1/4 13.2 @ 108

 

I blew an injector in my car and with all the shaking and the age of the cat, it is hollow now! The car works fine with it and I have a 3" exhaust. It sounds much meaner and it flows well. I get about 25-27 MPG highway at about 80mph.

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91 Z28 Camaro
305 TPI
Flowmaster 3" exhaust
700R4 with 2000 Stall and shift kit 3.42 rearend
One sweet sounding system

 

thanks for the help. are heated O2's easily available just in case? This sounds like a good thing to try.

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