i know its iligal on ......

but does anyone really notice any difrence, if so what kinds? gut it? replace w/ pipe? or a highflow?


-Stell

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1988 IROC 305TPI MINT!!
Mods= Accell SuperCoil, MSD 6A, Ported Plenum, No MAF Screans , K & N, 160 Thermostat+ Temp Switch
And Always Trying To Go Faster

 

I have a 305 TPI and I just installed an exhaust system. I have a high-flow cat and flowmaster. It sounds really good and there's definately an improvement in performance. My friend has a '92 305 TBI with flowmaster and no cat. I don't hear any difference, in fact, IMO mine sounds better and the muffler hasn't broken in all the way. If I were you, I would put a high-flow cat on. From what I've learned, there's really not much difference in performance but more diff in sound. Depending on where you live, you'll need cats to pass the emissions test. Also, I know the world is polluted but don't contribute into making it any worse. We can make this world a better place

 

The is only one drawback to a high flow cat, that after time it will get clogged, much like the OE ones do, and then you will lose performance. I would just gut it and put a piece of pipe inside 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 Aerochamber Cat-Back System, Performance Resource Chip with 160* Thermostat, Accel Ignition Components, K&N Filters, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET : 14.3 @ 97mph
(corrected for elevation)

 

Will a high-flow cat pass inspection?

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1988 Firebird Formula 305 TBI, T-Tops, RED.
Of course ... 5-Speed

 

Yes most high flow cats are 50state legal. Look at Catco in summitracing.com s catalog. They are like $99 each for our cars. A hell of a lot cheaper than $230 each for a stock one from GM!

 

High-Flow!!

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Looking for:

87 IROC-Z L98
84 TRANS AM H.O.

 

DOH! Do you think they'd still be in business if it didn't ?

 

gut it, thats free

 

High-Flow...i have a random technologies on my lil 2.8 and i felt a difference..i had it gutted for 2 weeks and didnt feel the difference of the random tech. cat

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88 Firebird 2.8
MODS (either coming or on):
Flowmaster Cat Back, Random Technologies Cat, 3" intermediate pipe, 10.4 Taylor Race Wires, MSD Coil, MSD Ignition Module, B&M Shifter, Transgo Shift Kit, Cold Air Induction..Then peeling and cracking paint..
2"cowl hood
3.4 engine -new-
s/c'r then im done, maybe some no2...

 

hi flow!!! i got a random tech one through a gp for 175...but i think catco sells cheaper. they wont get clogged up if you take care ofyour engine...regular tune ups etc. and yes it will pass emmissions. good luck

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Rick
90 Camaro RS 305 TBI
350 on the way!!

 

cut the cat and straight pipe it

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1987 BLUE IROC
IT'S A DOG
BUT IT'S MY DOG
AND IT HAS A NASTY BITE......
http://members.fbody.com/cnyfbodies/tonyrusso.jpg