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08-15-2005, 02:16 AM | #1 | |
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test pipe vs. high-flow cat
Looking on e-bay I found test pipes, but for around $20 more I found high-flow cats. Question is would I pass emissions with a high-flow cat, and would it make a noticable difference in performance? Or would the test pipe be the better option?
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08-15-2005, 11:03 PM | #2 | |
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Re: test pipe vs. high-flow cat
I wonder what the manufacture claims about High-flow cat effiecency compared to new OEM. Maybe they would answer an email. There must be a reason that they don't advertise the answer to such an important question. Any used cat has more restriction than when it was new. My guess is that test pipe vs high-flow cat performance isn't noticable and not enough differance to measure. OEM with 100,000 mi vs high-flow at higher RPM may be where the greatest increase in performance is found. I think a good running engine W/ a high-flow cat will usually pass emissions testing in 49 states and won't pass visual inspection in CA.
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08-15-2005, 11:50 PM | #3 | |
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Re: Re: test pipe vs. high-flow cat
I had a cat that was bad on a 94 GMC Jimmy I owned. I replaced it with a highflow cat. It gave a little better performance, along with a little bit of a deeper exhaust sound than stock. It also had no problems passing emissions in IL. High flow cats as long as they aren't bad in any way should very well pass emissions in all states except CA. In my case along with several friend cases, the high flow cat actually lowered emissions from what it was OEM.
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08-16-2005, 12:12 AM | #4 | |
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I just found an old thread where a guy in Utah failed emissions with an OBX high flow cat. What kind of cats were you guys using demotim?
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08-16-2005, 10:33 AM | #5 | ||
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Re: test pipe vs. high-flow cat
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08-16-2005, 01:13 PM | #6 | |
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Re: test pipe vs. high-flow cat
Would you say another possibility might have been there was something else wrong with the engine? Cars with new OEM cats can fail emissions testing. There are no guaranties that a cat will make the difference between passing or failing. No doubt a new high-flow cat may be more efficient at reducing emissions than plenty of used OEM cats. Regardless of the name on the product many items originate from the same facility. If the cat looks the same on the outside, it probably came from the same facility. Some test pipe pictures look just like high-flow cats. State requirements are not as different as you might think. States that want to measure improved air quality follow what other states have done to measure better air quality and win the federal funding that goes with it. Illinois has very high emissions standards. While it is possible that the right individual at a muffler shop or emissions testing facility may have accurate information... so may a local librarian or fast food employee. Here's some great exhaust flow and muffler info but nothing specificly about cats.
http://www.nsxprime.com/FAQ/Miscella...austtheory.htm Last edited by JustSayGo; 08-16-2005 at 02:14 PM. |
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08-16-2005, 01:51 PM | #7 | ||
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Re: Re: test pipe vs. high-flow cat
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08-16-2005, 02:11 PM | #8 | |
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Re: test pipe vs. high-flow cat
As far as 48 state or Federal standards and the higher standards required by California, isn't Illinois the other state requiring the higher standards? demotim00 personal experience is very incouraging as far as 4trackmixtape chances of passing emissions in Washinton.
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08-16-2005, 02:40 PM | #9 | ||
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Re: Re: test pipe vs. high-flow cat
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08-16-2005, 05:18 PM | #10 | |
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Re: test pipe vs. high-flow cat
California makes it simple. No engine modifacation allowed. If the intake is aftermarket or A/M cat, the vehicle fails visual inspection and exhaust gases (4 rather than 2) are not analyzed. Blue headlight bulbs aren't legal either.
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08-16-2005, 06:14 PM | #11 | |
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The California Air Restriction(?) Board are really strict about engine mods, but a lot of parts are CARB certified these days. Imagine how much money is made in California alone off aftermarket parts. In 2007 Washington is going to adopt the same standards as the CARB, maybe even tougher.
I'll go ahead and get the new cat instead of the test pipe. Nothing's wrong with the car so I'm sure it'll pass emissions. |
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08-16-2005, 09:10 PM | #12 | |
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Re: test pipe vs. high-flow cat
Of course 4trackmixtape is right. I know which CA resident told me otherwise. I'm sure CA doesn't loose money researching and issuing Executive Orders for A/M parts. Neither will any other state. Parts will be more expensive as more states get their share. Another slick hidden tax.
http://www.arb.ca.gov/msprog/aftermk...es/amquery.php |
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