High flow catalytic converters: Is it a MUST TO HAVE mod?
Originally Posted by Alang
Isn't there a federal law that says you can't replace your factory cats prior to 50K miles? You have to make sure your factory cats are "damamged (cough cough)" in order to replace them.
I doubt it would ever come up, but does anyone know for sure, and what the reasoning behind the law was?
I doubt it would ever come up, but does anyone know for sure, and what the reasoning behind the law was?
even though most hi-flow cats are carb certified and will pass sniffer emissions testing...it is illegal to replace them...but only IF you get caught
Changing your OEM cats to ANY other cats is illegal period even if they pass the sniffer/visual test. You can only get another one if the OEM cats are no longer made/available. But this obviously hasn't stopped anyone from doing it anyway. It's merely the "it's legal until I get caught" kind of thing which you can easily say to just about every mod out there without a CARB number, DOT approved, or state OFF ROAD USE ONLY.
As far as the "must have" question of the cats...I wouldn't consider it as a "must have". Like many other components to your car, one piece simply supplements another. It will make your overall exhaust setup more complete which benifits in better response & in an increase of HP/TQ. One obvious benefit if you change the cats of our car is flow & weight since the OEM cats are essentially 4 total cats & it's massive in comparison to aftermarket ones! This is the same for our Y-Pipes which looks like a freakin tank! Overall, what has been found most restrictive about our OEM exhaust/intake setup is our Y-Pipes, Cats, Headers, & Plenum (front cylinders).
Hope this helps.
- James
As far as the "must have" question of the cats...I wouldn't consider it as a "must have". Like many other components to your car, one piece simply supplements another. It will make your overall exhaust setup more complete which benifits in better response & in an increase of HP/TQ. One obvious benefit if you change the cats of our car is flow & weight since the OEM cats are essentially 4 total cats & it's massive in comparison to aftermarket ones! This is the same for our Y-Pipes which looks like a freakin tank! Overall, what has been found most restrictive about our OEM exhaust/intake setup is our Y-Pipes, Cats, Headers, & Plenum (front cylinders).
Hope this helps.
- James
Last edited by GTNPU Z; Mar 24, 2005 at 04:32 PM.
Thread Starter
Joined: Oct 2004
Posts: 10,067
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From: Yorba Linda, CA
alrite..since everyone has it, i will order one too. hehehe..Thanks guys
btw James, the body shop that paints my interior and roll bar finally has some open spot (since they are freaking book up) $1000 for 4 pieces. Will drop off next monday. Let see how they turn out and you can go there too.
btw James, the body shop that paints my interior and roll bar finally has some open spot (since they are freaking book up) $1000 for 4 pieces. Will drop off next monday. Let see how they turn out and you can go there too.
Last edited by Bubble; Mar 25, 2005 at 06:18 AM.
Originally Posted by Tony@Performance
I am using the crawfords and have never had one issue with them. they do not rasp, and they have not had any issues with breaking or cracking. Also, they fit much better than some others out there and they are lighter than stock, so that's always a plus.
PM me if you want to go with crawfords, i'll take care of a good price for you
PM me if you want to go with crawfords, i'll take care of a good price for you
I am interested in the crawfords. Just curious, how is it better for me to order from you guys versus just ordering direct from Crawford ? Please PM me with your good price
Thanks.
I just installed my Kinetix HF cats and Pro-1 y-pipe. The Kinetix cats are lighter than the stock cats by like 15lbs overall, and new y-pipe is 5lbs lighter.
I didn't get a chance to test out the car yet very much, but engines seems to rev quicker above 5k rpm, and sound is more solid overall.
I didn't get a chance to test out the car yet very much, but engines seems to rev quicker above 5k rpm, and sound is more solid overall.
Registered User
Joined: Mar 2004
Posts: 1,144
Likes: 1
From: West Springfield, MA
Originally Posted by Tony@Performance
I've never heard of such a law, but there may in fact be one.....
I'm sure that something like that would be enacted to help ensure that the cats on newer cars 1)stay on the cars, and 2)to act as a deterrent to changing them out needlessly.
I'm sure that something like that would be enacted to help ensure that the cats on newer cars 1)stay on the cars, and 2)to act as a deterrent to changing them out needlessly.
There is such a federal law as mandated by the EPA for all vehicles to be used on public roadways. That's why there is always a disclaimer on high flow cats that they are for "off road use only". (yeah, right, sure)
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Joined: Mar 2004
Posts: 1,144
Likes: 1
From: West Springfield, MA
Originally Posted by baron
I just installed my Kinetix HF cats and Pro-1 y-pipe. The Kinetix cats are lighter than the stock cats by like 15lbs overall, and new y-pipe is 5lbs lighter.
I didn't get a chance to test out the car yet very much, but engines seems to rev quicker above 5k rpm, and sound is more solid overall.
I didn't get a chance to test out the car yet very much, but engines seems to rev quicker above 5k rpm, and sound is more solid overall.
Sound is my biggest concern. When I replaced my stock exhaust with NISMO, the overall sound was nice but a bit loud under load, and there was a slight drone at a 3000rpm cruise. After adding NISMO intake and jet hot coated NISMO headers, the sound is much nicer. It is a little deeper overall, a little more muted under load, and there is no drone whatsoever. I'm afraid that adding HF cats on top of this will really just make it too loud again. Also, having a roadster, the sounds are a bit louder to begin with.
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