I have the dual cat option on my car. How can you tell when your cats have gone bad and are hi flow cats worth the money?

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91 Formula
305 TPI 5speed
1LE/G92/WS6
K&N, SLP airfoil, ported/polished plenum, March pulleys, TB coolant bypass,Crane AFPR(47psi),Crane Gold 1.6rrs,MSD coil,MSD6AL, Holley 9mm wires,Bosch O2sensor, SLP headers & catback,3:73s,180* t-stat,JET 195* fan switch, Macewen white face gauges, Autometer gauges, Zoom hi-performance clutch.
Street legal with stock throttle body, runners,intake manifold,cam, and heads.

 

give the old ones a nice wham! and if they rattle and tingle after....they are prolly bad. hi flow cats are worth it if you want to make some serious power

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Rick
90 Camaro RS 305 TBI
400 small block, Hooker 1 3/4 LTs, Random Tech Cat, Hooker aero chamber cat back on the way!!
TH700-R4 with Trans-Go shift kit (corvette servo here...but not installed yet)
MacEwen Motorsports White Gauge Overlays
14" K&N X-Stream Open Element
GTS Headlight and Taillight covers
5% Limo Tint all around
Classic White Chevy Bowtie sticker on rear window
http://www.geocities.com/esvalenz

Man if my camaro were a rice-rocket all those mods would give me what...easily 50-60 hp!!!

"Just because I've done it, doesn't mean I knew what I was doing!" - Me

 

When you can't pull hills you normally used to pass traffic on, lol.

When you notice a ticking sound from the engine bay or under the car.

The smell of fuel when you're not even really on the throttle that hard.

Cutting out and hesitation when you attempt to drive aggressively whatsoever.

Possible top end engine damage and carbonation of the engine (pull a plug out and look for black buildup)

Car fire due to prolonged driving the car with bad cats due to the intense heat created by this misfortune.

If in question, simply gut that puppy out till ya can buy a performance replacement.



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Dan Young
1995 Z28/M6
Groton, CT

1985 Z28/A4
(Prospective purchase)

 

How does one go about gutting the cats? I have keep thinking of making jack-o-lanterns , when "gut the cat" is said

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--Steve S-- 84 Trans Am 305 (cough)LG4(cough), 5 speed, Flowmaster 80 series, otherwise an emissions restricted slow 150 hp(chilton rating) 240 torquer that needs RELEASE!!!!

P.S. Daily Driver

 

You take off the y-pipe/cat converter assembly, take a heavy bar or chisel and hammer, and carefully proceed to breaking apart all the internals inside the catalytic converter, paying attention to not damage the air tube leading into the cat (if so equipped). Once you break up all the materal (do not leave anything inside, gut it completely out), reinstall it on your car. You can do a check with the cat off the car to ensure that heat shield isn't going to vibrate and drive you buggy before reinstall, but not a requirement. This will reduce heat, backpressure, and should increase performance quite a bit, if the old one was clogged badly. Hope this helps..



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Dan Young
1995 Z28/M6
Groton, CT

1985 Z28/A4
(Prospective purchase)