Besides a exaust leak.

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86Z28, GM 350, Jet perf Q-jet & chip Dual snorkel air cleaner, Edelbrock performer intake, Edelbrock headers, Edelbrock cat-back, Off road pipe, MSD 6AL, Accel Super Coil, Taylor Spiro-pro wires, Rapid fire plugs, Jet fan switch, World class t-5, Hurst Short Throw Shifter, Ram Flywheel, Center force dual friction clutch,Aluminum drive shaft, BW disc rear 3.45's & a posi, PBR calipers, Earls braided brake lines, Polygrapite bushings all the way around, poly tranny mount & torque arm mount, Hotchkis lower control arms & panhard rod, Rancho limiter straps, KYB struts & shocks, Gm Wonderbar, Edelbrock strut tower brace, SSM sub frame connectors, Jamex lowering springs, Carbon metallic brake pads, Crossed drilled rotors, Mobil 1 Tranny fluid & motor oil, GM syntheic rear end oil, K&N, Grant stering wheel, 1,200 watt system, Jet Black Paint, 91 Z28 rims, 92 wing, Tinted windows.

 

hehe, it'll make a nice machine gun sound but its not a good thing.. a pipe plug i screwed in one of the holes in my '83s manifold came out and it sounded like crap

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• 83 Z28-- not a pretty site to look at, 200k miles and im sure it was treated like a rental car every day of its sad life(before i got it).. sold, thank the lord
• 74 Z28-- 383/400, green on black. pretty clean. FOR SALE!!!

 

You won't get an exaust leak- there is a check valve between the AIR system and the headders, but that's deffenetally not good the cat or the rest of your emissions, because the cat uses the O2 the air system to break down hydrocarbons into CO2 and O2.

 

well then you should just go ahead and gut the cat since you're obviously not concerned about emissions. then the exhaust will be louder.

 

It WILL leak if you dont plug them Try it and you'll see.

 

Besides the leak?

I used to work at Domino's Pizza, they replaced the deck ovens we originally had with conveyor ovens... Middleby Marshall I think... Anyway, the way those worked was they would blow hot air (550ºF) through 1/4" diameter holes, very similar to what your car will do with those holes open. Its hot enough to cook a pizza in 4 minutes and 50 seconds at that temperature at a distance of 2.5" from the pizza... so basically anything within 2.5" will be cooked in a matter of minutes, and stuff a little farther away will soon follow.

The cat will work fine without the air system hooked up, it only aids the emissions process but its not absolutely necessary for it to work.

[This message has been edited by madmax (edited July 15, 2001).]

 

If you keep the diverter valves from your stock manifolds and put those on the new headers you won't have an exhaust leak. I'm not sure what other effects it would have but as long as it's plugged with the valves, I don't see what harm it could cause..

 

I blew my plug out once when I was racing in the old 86TPI

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89 Trans Am Turbo 3.8L All stock 43,000 miles #1053 of 1555

Past Thirdgen:
86 Trans Am w/ built 355TPI with SLP goodies and too much other stuff to List. One sweet *** car, wish I would have had a good enough Job to pay insurance on three cars so I could keep it, but for a 89 Turbo Trans Am w/ Low miles, I think I made the right choice!

 

Sounds like an uncovered conspiracy! It it only takes 4 minutes and 50 seconds to cook a pizza, why do they always tell you 15-20 minutes over the phone?! We all must unite and DEMAND our pizzas in 5 minutes!

 

There is a check valve there, but you could still have a slight exhaust leak. The bigger problem is when you back off the gas from a high RPM, the vaccum in the exhaust manifolds draws fresh air in through the check valve and mixes with the hot, unburnt fuel creating a very loud backfire. Sounds like a gunshot. Not good for the rest of the exhaust. Just cap then with a radiator bypass cap and a hose clamp from an auto parts store.

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89 Transam GTA, 350TPI, auto, 3.27 rear, dual cats, gray.
Magnaflow cat-back,
K&N open element,
Best E.T. 14.63@95mph

 

It could even take less than that
If it took more than 10 minutes from start to finish, they are doing something wrong.
This is technical though, right?

 

The cat has been replaced by a off road pipe, I used screw on caps, But one fell off, so I was wondering if it was okay to drive it intill I got another.

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86Z28, GM 350, Jet perf Q-jet & chip Dual snorkel air cleaner, Edelbrock performer intake, Edelbrock headers, Edelbrock cat-back, Off road pipe, MSD 6AL, Accel Super Coil, Taylor Spiro-pro wires, Rapid fire plugs, Jet fan switch, World class t-5, Hurst Short Throw Shifter, Ram Flywheel, Center force dual friction clutch,Aluminum drive shaft, BW disc rear 3.45's & a posi, PBR calipers, Earls braided brake lines, Polygrapite bushings all the way around, poly tranny mount & torque arm mount, Hotchkis lower control arms & panhard rod, Rancho limiter straps, KYB struts & shocks, Gm Wonderbar, Edelbrock strut tower brace, SSM sub frame connectors, Jamex lowering springs, Carbon metallic brake pads, Crossed drilled rotors, Mobil 1 Tranny fluid & motor oil, GM syntheic rear end oil, K&N, Grant stering wheel, 1,200 watt system, Jet Black Paint, 91 Z28 rims, 92 wing, Tinted windows.