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a lot of my friends with the old DOHC's have test pipes on their cars... (straight piping... no cat) and it adds ponies to the engines ... how much will it add to our cars??? anybody have one and experience any power change?? thanks

 
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Ask ASNBOYSRFR he just got his straight pipe put on with no cats he got intake exhaust and header i rode in his car yesterday and it was quicker well it seemed a little quicker but ask him

 
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i hear 1 or 2hp...its the header that helps...get a topspeed header from circax www.circa-x.com

 
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I already have a header... but i was just interested to see how many people have straight pipes and no cats... and see what kinda difference it makes... it's reall cheap so it's not a bad mod i guess

 
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The stock cat is pretty restrictive. A test pipe will give you a more free flowing exhaust. It is a nice addition to I/H/E. You will see some gains but dont expect too much. It adds a nice tone too. I would recommend you do it..it's cheap HP.

 
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I noticed more gains from the test pipe than just a header.

the inlets are 2.25" ... but inside the stock pipe, there are welded parts that are only 2"

 
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What about the OBD II sensor on the cat? Is it a problem or do you have to bypass it somehow?

 
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mil eliminator ... from bigjoshracing (warning: advertising) and his group buy with his kamikaze header n stuff ... it works ... so far I haven't had my check engine light on and it's been about 100-150 miles so far

 
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i just gutted my cat ive noticed a difference in 4000 rpm and up. great sound. lost a little bit of low end seems to bog down off the line but will soon be installing a race header i just found, that will eliminate my cat. but all in all i like the results. no dyno testing

 
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I have the HP Race w/ hiflo cat, this threw a CEL for the 2nd o2 sensor but if you just reset your ecu a few times it will go away, or you could just drive with it on untill it goes off.

You'll get a CEL after (2) long trips. I was planning on getting the o2 Simulator but didnt have the money at that point so i just reset the ECU. I reset it 2wice (4 long trips) and It didn't come back. Save yourself 50bux and keep your o2 sensor. This CEL won't put your engine in "limp mode". Good Luck.

 
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dood im making a few o2 simulators that work just fine, im testing one in my car, so far its been 150 miles with no problems or check engine light on

 
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i am gonna be selling them for $20 shipped, which is about $5 more than the mil eliminator that bigshowracing is selling them for, but this is for the overhead... ill try to get them out for even less but shipping always kills most of the deals...

 
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ive reset my ecu like 3 time with the fuse 2 times with taking the negative off the battery. arter about 20 miles it comes back on.

 
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well i'm probably gonna get a bigger header but keeps teh cat... and i wanna get rid of it... so i think i am gonna buy a test pipe and put it on.. is it hard to install??? or do all i have to do is unbolt the stock cat.. and bolt in the test pipe plug in the o2 sensor and go...?

 
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you can buy a hp header that replaces the header and cat 4-2-1

 
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test pipes have o2 sensor bungs... so yea.. plug it in there.. you will still be able to go.. just that you are gonna have issues with the check engine light because your cat isnt there...

 
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Easy install, unbolt stock, bolt in new parts, and plug in the o2 sensor. I haven't had any problems with my CEL after a few resets, maybe you are having other issues with your car. I have talked to a few people that just let it go and it eventually went off. It's not how far you drive, it's the amount of trips you take. You can take (1) 600 mile trip and still need another trip for it to trigger. Mine would go on after (2) 30 mile trips (to and from work) then it would go on next time i started the motor. Reset 2x and it went away...good luck.

 
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but how do you reset??? just unplug negative cable on battery?

 
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thats one way to do it

 
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ok.. what if i want to put back my cat? should i just bolt it in and the CEL will not light anymore? im thinking of doing this.. coz i plan to put back my cat everytime it's time for the smog test..

 
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yea it should go away

 
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I have been running a straight pipe for about 6 months now ... After installing, my CEL lit almost immediately ... I reset countless times and it just came back ... When emissions rolled around this year, I put the cat on, reset, tested (and passed) then re-installed the straight pipe ... Within 14 hours of the re-install my CEL lit and has been on ever since ... I mean, its no big deal putting the cat back on 1 time a year but it do0es get tiresome ...

 
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get an o2 simulator ... bigjoshracing's mil eliminator works great ... been about 250 miles and cel still hasn't come on

 
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yea $15 for a resistor...

 
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its probably just a voltage cap diode...if i knew how many volts the secondary o2 sensor was spitting out with a cat i could make one myself

 
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You can pull your negative battery cable, but that will reset all your electronics not just your ECU (I.E. Stereo Settings, etc etc) You can pull the 7.5A Fuse (01 ex) Under the hood. Reguardless it is labeled at F.I ECU.

Pull it for a few minutes, put it back in, start your car and let it idle for 5min turning on all your accessories (Headlights, AC, etc etc) but dont hit the throttle. Then turn your motor off, on, off, and your ready to go. (This is the procedure honda/acura tech's use)

I reset 2x and my CEL went away. I got a new exhaust and it came back, after 1 reset it went away again. It's been over a year without it.

 
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cool thanks

 
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will the simulator help "pass" a turbo'd vic on a smog check?