I am curious if there are any negative effects, short of hurting the environment, of taking the belt of my smog pump and running a gutted cat. Thanks.

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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

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

 

The only negetive effect is getting fined if you get caught.While the AIR pump removel may not give you more power,it will get some of the "Garbage" out of the way.Gutting the cat.will give you about 10HP (give or take)
Nitro Don

 

REMOVING the smog pump(as in taking it completly off) will lighten the front end by about 20 lbs and improve handling. taking the belt off will free up 5-10hp because it takes extra effort for the engine to turn with it on-like underdrive pulleys and people not running with A/C

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1991 RS LO3
mods: 14" chrome air cleaner, straight-piped after cat exhaust with one chrome dual tip on the left side.
future mods: headers, removing smog equipment, and as many cheap mods as i can find
aol s/n: budman8503

GONE MUSTANG HUNTING.......
BACK IN 10 SECONDS

 

Also what will happen with the AIR will exhaust go back up the tubes from the headers? Will it go back up from the Cat? Will this head towards the solenoid housing and back into the engine bay? And what harm can this do. Thanks.

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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 IAC,

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

 

Your tag says that you are from NY.
There sould be strict laws enforcing the emmisions there. The belt will free up HP not much at least not anything noticble. the removal of the cat will give you a noticable amount of power especially if its clogged up.
As far as the air tubes on the manifold it can be bent over or plugged. the air tube from the cat can be removed, theres a bolt on the back of the head. But i would not remove the smog crap unless you dont have to do an emissions test it is against the LAw