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Discussion Starter #1
which one is better. i heard the straight pipe would give you better performance but is not smog legal. does anyone know which one would give better performance? and the straight pipe is cheapter too.
 

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In terms of performance a str8 pipe is better than a hi-flow cat but ur car will be louder and will not pass emissions tests. Depending where you are there are big fines for not having a cat-coverter.
 

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Take a look at this test of a 2.5" Carsound cat vs 2.5" test pipe on an Integra Type R.



Yeah where's all that test pipe power I've heard so much about?

My conclusion from this, test pipe =
 

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Thats because this Integra is NA, a test pipe on a boosted car will yield hella good performance gains. As far as putting one on an NA car..I have one on my GSR, I did notice a little loss low end, but believe it or not I can definately feel a crazy high end rush. Just to warn you though it is very loud.
 

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I think I will go with the printed dyno over your butt dyno unless you can crap out a chart for me.

A test pipe over a stock cat will have some gains, but compare the test pipe to a good high flow cat like the Carsound and it's nothing. Just look at the flow numbers in the cat article, the Carsound is pretty close to it's equal-sized test pipe counterpart.

Turbo or S/C may be able to utilize the slightly higher flow capacity of the test pipe, but I didn't see either mentioned anywhere in this thread, I would think this thread would have been put into our F/I forum then. I'm assuming this is in regaurds to a bolt-ons N/A setup, in which case a test pipe will not outperform a high flow cat.
 

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Discussion Starter #8
to GSxRated, do u reccoment gettin a straight pipe or a car sound cat? because i cant afford to lose low end power, but my stock cat sux riote now. any suggestions?
 

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Let me put it this way... with a test pipe YOU WILL NOT PASS EMISSIoNS!

Do you want to change your exhaust every year to get it smogged, then put it back and risk getting a ticket becuase you car smells like ass and is polluting the environment?

Or... Would you rather put on a Car Sound cat that flows almost as well as a straight pipe in tests and not have to worry about it for a long, long time?

The choice is yours. Oh, by the way... Have you every been to L.A. (or most other large cities) when the sky is brown from smog and you feel like you are gonna develop Asthma just by looking at it? In case you don't get my drift, smog looks like this:

 

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Discussion Starter #11
lol, ok i get the point. how often do you have to go in for a smog check. i can just keep my old stock cat and put that on evertime i have to get a checkup, that way, I WILL PASS EMISSIoNS.. just a thought.
 

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I just noticed you live in California. Do yourself a favor and get the Carsound. The fine for running a test pipe is quite hefty in our state. Police are beginning to do roadside smog checks and if you are caught with a test pipe you will be short thousands of dollars and possibly jail time if the judge feels nasty that day. Kind of seems pointless to me as a CARB legal Carsound cat will perform just as well, not pollute the air, and keep you out of jail. California does not mess around when it comes to pollution and with good cause. I don't understand the idea that your car has to be a gross polluter in order to perform. HyTech's header-cat-exhaust system will outperform any exhaust system out there and it runs cleaner than the stock system...
 

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Fentoozler45 on 15/June/2002 said:
Let me put it this way... with a test pipe YOU WILL NOT PASS EMISSIoNS!

Do you want to change your exhaust every year to get it smogged, then put it back and risk getting a ticket becuase you car smells like ass and is polluting the environment?

Or... Would you rather put on a Car Sound cat that flows almost as well as a straight pipe in tests and not have to worry about it for a long, long time?

The choice is yours. Oh, by the way... Have you every been to L.A. (or most other large cities) when the sky is brown from smog and you feel like you are gonna develop Asthma just by looking at it? In case you don't get my drift, smog looks like this:

thank you for putting that up...we deal with a lot of asthma in kids and smog alerts are not helping...testpipes on a race only situation is one thing but testpipes on daily drivers that idle for more than 2 min.? sorry, but you can't call yourself an adult or intelligent if you do that...you can call yourself self-centered though,....yes I am being serious and if I pissed you off, I apologise. Just my humble opinion only though...you can do whatever you want (unfortunately for all of us if you choose a testpipe that gains little over a properly sized cat).

BTW you can get a Carsound cat at

www.ipsracing.com

or

[email protected]
 

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Does adding a straight pipe produce backfire? My friend has it on his Civic HB with a GSR motor and everytime he revs it in the parking lot, it sounds like a pop gun. It sure is embarrassing.
 

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Its very simple. Get a carsound cat. They're very inexpensive when compared to other bolt on modsand flow almost as well as a testpipe.
Testpipe is only worth it if you're FI and want a few extra ponies at the track.
 

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Which Carsound cat will i need? 2 1/4 or 2 1/2? I have a Greddy Evo Exhaust, if that helps. Need to order asap, so any help with this would be awesome.
Thanks guys -- 97 GSR
 
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