I have a cat back exhuast now and was wondering if I should take off the cat. If I take off the cat will I gain or lose horsepower?? I have a 305 LG4 and the exhuast goes one back into a cat and then out duals

 

gain

 

Ditto.

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1990 IROC 350
Mods: Too busy trying to make it run right to mod it.
Airfoil, Dynomax cat-back, MSD coil, 180 t-stat, Bald Eagle tires,
Hypertech fan switch, Accel 23# injectors, Holley module, ported plenum,
Ported Daytona Yellow stock base, Moroso valve covers, other stuff,
Streetdampr, Ruger P95DC, hot wife, new oil filter, !cats, !TBC, !AIR.
18.0 @ 85MPH since I'm one big-a$$ MF
"It's better to have and not need than to need and not have."

 

Dosent that make your exhaust louder too?

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1988 Jet Black IROC
5.7L W/ 64000 miles
Flowmaster Exhaust
Fully Loaded
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My IROC In Readers Rides
My IROC

 

yes.

 

If you still have the stock cat on there, remove it and replace it with a new aftermarket cat at once. The stock thirdgen cats suck and have been proven to be a significant restriction. However, the new aftermarket cats flow really well and you will not lose more than a couple horsepower, if at all.

Gutting your cat, or running with no cat, is a federal offense punishable by jail time and/or a fine, I think up to $10,000.


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1991 Camaro Z28
5.7L 5-Speed (originally 305)
317 RWHP, 418 RWTQ
13.23 @ 107.62 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Member: SoCal F-Bodies
-=ICON Motorsports=-

 

I currently have no cat...thanks to the previous owner. I want to get one...b/c it is too damn hard to pass NY state emissions tests w/o one. Now what is a good brand of Cats...I want a high flow high performance Cat. I might just get a new cat...along with the Flowmaster american thunder 80 series. At a local Speed shop they are going to sell me the Flowmaster muffler for $90 and a high flow cat for $99. Then I will have to go to mieneke and have them run thier pipes...since that is the only way to do it around here. So is $99 too much? How would the 80 series american thunder sound? I have no hedders...and do not plan to install any as of now...but possibly in the future. Will my car still sound good? I have a 350 4 bolt. Thanks.

James

 

save youself a bill to the muffler shop and just get a Hooker catback for $260.

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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