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per this thread in Duratech Performance, will a high-flow cat pass emissions in CA? Im thinking of using a test pipe and saving a stocky cat for smog time. BUT, if a high flow cat will yield the same hp gains as a test pipe than ill just use that, period. i see that Trubendz sells high flow cats. anyone know whats up with these? ill be using this with a weapon r headers/y pipe setup and trubendz magnaflow exhuast. 
Originally posted by Tourgasm:
Sometimes you can mess up a word so bad that spell check doens't know what the hell you're talking about.
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I am not sure about those "high flow" cats, but when i was having issues passing smog, i purchased a so called 'high flow' cat from magnaflow.
i was running gutted cats and mils plus the new 'high flow' cat. i failed the smog test before the new cat and my readings actually got worse after replacing with the new 'high flow' cat.
i dont know if you can have larger openings in the cat and still maintain the same emissions level. even if the cat is bigger, i think the higher the flow, the more likely your toxins will just blow right by the cat.
just my opinion.
Last edited by GoldenTour; 09/09/05 02:57 PM.
~Crystian
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my SHO Shop Y-pipe with high-flow cat passed emissions with flying colors... tried and true models should work well.
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Originally posted by Toadster:
my SHO Shop Y-pipe with high-flow cat passed emissions with flying colors... tried and true models should work well.
Just passed smog in June with my Sho Y as well. Neither Toadster or myself were running gutted pre-cats or Headers though. 
Money doesn't always bring happiness. People with ten million dollars are no happier than people with nine million dollars ~ Hobart Brown
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Originally posted by Fmr12B:
Originally posted by Toadster:
my SHO Shop Y-pipe with high-flow cat passed emissions with flying colors... tried and true models should work well.
Just passed smog in June with my Sho Y as well. Neither Toadster or myself were running gutted pre-cats or Headers though.
And i think that the Pre-cats do most of the work and the underbody cat is just the added insurance. so if you run headers or gutted pre-cats you might pass on the high side. key word is MIGHT. are you willing to take the risk?
you could probably take the precats off and put your headers and when its time for smog, put your precats back on. its up to you if you wanna go through the hastle every 2 years.
I have MIL eliminators for sale. home made using surface mount components so the pcb is smaller than a nickel. i can shoot pics for you. shoot me PM if you'd like them.
ohh and i just bought new pre-cats and i really didnt feel the difference between gutted cats or new pre-cats.
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Its not really worth the money IMHO. You might gain 1-2hp, but that's about it. The stock cat isn't really much of a flow restriction. Having said that, I did just pick up a test pipe myself, so do what you like...
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Originally posted by GoldenTour:
And i think that the Pre-cats do most of the work and the underbody cat is just the added insurance.
The precats are for start up emisions, that why there so close to the heads so they light up quick. It is possible that you could pass emmisions with just the precats and no main cat. But ounce the car and main cat is hot, the precats do nothing but restrict flow, that why people get such big gains from headers, and as long as you have a proper working main cat, you will pass emmisions with headers no problem
98 csvt t-red.. sho-shop intake, b&m, fidanza, spec1 clutch, Torsen, DMD,optimized Y& TB, Brullen, rear strut bar,h&r's,17" konig traffik's.
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Jeez Steve, going for full-on CARB legal, eh? 
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i was going to get a high-flow magnaflow cat to go with msds headers/ypipe but after reading all of this i am not so sure...
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WR headers/ypipe -TB hiflow cat
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Originally posted by Tourgasm:
Sometimes you can mess up a word so bad that spell check doens't know what the hell you're talking about.
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only lol 
