Will it hurt or help my car? How do I do it?

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission with 2.77:1 Rear End

Current Mods: Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip with 160* Thermostat, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET : 14.32 @ 97.7mph
(corrected for elevation)

Soon to come: LT4 HOT Cam, Air Flow Research 190cc Heads, 2800 RPM Stall Converter and SLP 3.70 Rear End Gears.

 

From what other people have done they just told me that they take the CAT off and take out all the restriction crap from the inside out. If I were you I would get a high flow CAT b/c your car still has to be smogged so why run the chances of it not passing by gutting a CAT ya know. I bought my high flow CAT from Summit for $59.99

- Mike Harvey -

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The '86 Firebird http://www.geocities.com/flash_point2002

 

BTT

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission with 2.77:1 Rear End

Current Mods: Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip with 160* Thermostat, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET : 14.32 @ 97.7mph
(corrected for elevation)

Soon to come: LT4 HOT Cam, Air Flow Research 190cc Heads, 2800 RPM Stall Converter and SLP 3.70 Rear End Gears.

 

Ok I feel like a moron I know what the other ones stand for but what does BTT stand for.

- Mike Harvey -

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The '86 Firebird http://www.geocities.com/flash_point2002

 

It means back to top and on the cat issue. When I took my cat completly off my car and put a straight 3" stainless steel pipe in there instead I lost a little bit of torque down low. Has to do something with backpressure. Just some info for ya on that. So its up to u.

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Eric Natzke
91 Firebird 305 TBI (ZZ5 summer of "01")
ASCD Ram Air Hood-3" custom exaust-Flowmaster 80 Series-No Cat-Edelbrock TES Headers (coated)-March Pulleys-TBI Spacer-K&N Open ELement-TransGo Shift Kit-B&M Supercooler 28,000 GVW-Hypertech Thermomaster-160 Stat-3:42 GM Gears-Auburn Posi Unit-Edlebrock Strut Tower Brace-MSD Superconducters-MSD Cap & Rotor-MSD Blaster Coil-Rapidfire Plugs-265/50/R15 Tires-Emmison's all Gone
http://members.aol.com/j007golden/91firebird.html

 

I've either gutted or removed the cat on every vehicle i own....i'm in Connecticut and the emmisions test us every 2 years.....I've never had one fail just for a missing cat.
If the engine is running clean the cat does nothing....the way it works is to trap exaust gas heat and create a temperatue inside the cat high enough to "re-burn" all of the gas that isn't burned in the cumbustion chamber. Thus the reason your owners manual says not to park on dry grass or leaves....your cat is probably and average temp of 300 degerees or more..

just one man's opinion

 

There actually was an article if removing the cat was benefitial towards hp and torque. They also happened to do it on (I believe) an 89 Z28, the Z28 had a blower and was a 305 TPI. It proved to net about 5 more hp and lose about 7lbs/ft of torque with the cat gutted. So it's up to you if you want to do it, I did it on my 88 RS and saw no big gains, a hi-flow cat will benefit you just as well.

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90 Iroc LB9 5spd G92
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Dual Cats, 3.42 Borg Warner w/Posi, TPIS Airfoil, K&N, 160 Thermo, Mobil 1 Extreme Formula 0W-30 Synthetic Motor Oil, Home Made Ram Air, ACDelco Plugs, 8.8mm 300+ Accel "Race" Wires, Accel Cap And Rotor, Ported and Gasket Matched Plenum, TB Coolant Bypass, Advanced Timing To 10 BTC
Best ET(Not Corrected): 14.4 @ 94mph with 2.022 60ft
My 3rd Gen Web Page

 

i was going to do it because i wanted my car to be louder and i cant afford a high flow cat. i dunno. i need a different muffler than the stock one i have too, but hey, im poor.

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beau-t-ful yellow 85 iroc