Resonated Test Pipe
03-31-2010, 09:38 AM
#1
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Resonated Test Pipe
So here in PA, in order to pass the state emmissions , you must have a muffler and something that could be passed as a catalytic converter ( just has to look like one with a place for an O2 sensor post cat). So i was thinking of ways to stay legal but w/o a cat...
1) Hollow out cat
- pros: less restriction, pass inspection
- con: creates turbulence
2) Test pipe
- pros: straight through, no turbulance, major hp gain
-cons: doesnt resemble a cat whatsoever, fail inspection, get pulled over, get car towed and get a hefty fine
3) Replace stock cat with a resonated test pipe,
like... http://cgi.ebay.com/ebaymotors/Nissa...Q5fCarQ5fParts (although this one is non-resonated...)
pros: resembles cat, straight through design, passes inspection, to the cops eye, when it gets dirty, it will resemble a cat... for the most part... major hp gain.
cons: must cut out cat and weld new O2 bungs, drill hole in bottem left side after put on car to allow the expanded air inside the "chamber," as you will, so it doesnt blow a cheap ebay weld.
Anybody's input or personal exp. with a resonated test pipe?
1) Hollow out cat
- pros: less restriction, pass inspection
- con: creates turbulence
2) Test pipe
- pros: straight through, no turbulance, major hp gain
-cons: doesnt resemble a cat whatsoever, fail inspection, get pulled over, get car towed and get a hefty fine
3) Replace stock cat with a resonated test pipe,
like... http://cgi.ebay.com/ebaymotors/Nissa...Q5fCarQ5fParts (although this one is non-resonated...)
pros: resembles cat, straight through design, passes inspection, to the cops eye, when it gets dirty, it will resemble a cat... for the most part... major hp gain.
cons: must cut out cat and weld new O2 bungs, drill hole in bottem left side after put on car to allow the expanded air inside the "chamber," as you will, so it doesnt blow a cheap ebay weld.
Anybody's input or personal exp. with a resonated test pipe?
Last edited by BoardSnow6; 03-31-2010 at 09:42 AM.
03-31-2010, 10:43 AM
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Pros a little more throaty sound, maybe a little HP gain.
Cons, probably gonna get a cel, if the inspection uses a sniffer to test the carbon your going to FAIL!
Best Solution IMHO invest in a quality aftermarket exhaust or switch the cat back and forth between inspections if you have a spare.
Cons, probably gonna get a cel, if the inspection uses a sniffer to test the carbon your going to FAIL!
Best Solution IMHO invest in a quality aftermarket exhaust or switch the cat back and forth between inspections if you have a spare.
03-31-2010, 01:50 PM
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im with skeezer ^^ I never heard of having something that "resembles a cat" such as a resonator being able to pass inspection in place of a cat, plus no cat means your CEL will be on, so theres no way around it. Just keep your oem mid pipe and pop that sucker on before inspection, then put the midpipe back on when your done. Thats what I do.
You can also look into getting a midpipe with a high-flow cat if your that set on a midpipe and dont want to spend the 30 minutes (if that) swapping your pipes.
You can also look into getting a midpipe with a high-flow cat if your that set on a midpipe and dont want to spend the 30 minutes (if that) swapping your pipes.
03-31-2010, 02:15 PM
#7
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Great question…
Ironically, I am in the middle of this as we speak. I just ordered a hi flow cat and am installing it with my mazdaspeed exhaust.
Don’t know how I feel about it or how it will sound or if it will cause a CEL, but I am going to give it a shot. I put the MS exhaust and MS intake last night and I am currently sitting in my office waiting for the cat to arrive. I might put it on tonight, I might wait till the weekend. In any case, I will put up pics and a vid on the sound since I have looked all through the threads and could find this set up.
Will let you know.
http://www.rx7store.net/product_p/rx...flow%20cat.htm
Ironically, I am in the middle of this as we speak. I just ordered a hi flow cat and am installing it with my mazdaspeed exhaust.
Don’t know how I feel about it or how it will sound or if it will cause a CEL, but I am going to give it a shot. I put the MS exhaust and MS intake last night and I am currently sitting in my office waiting for the cat to arrive. I might put it on tonight, I might wait till the weekend. In any case, I will put up pics and a vid on the sound since I have looked all through the threads and could find this set up.
Will let you know.
http://www.rx7store.net/product_p/rx...flow%20cat.htm
03-31-2010, 02:18 PM
#8
I zoom therefore I am.
saw too many people have the rx7store cat fail after a year or so... went catless in california. when it's time to smog i'll be putting my old cat back on, testing, then taking it right back off 
04-05-2010, 09:23 AM
#9
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Great question…
Ironically, I am in the middle of this as we speak. I just ordered a hi flow cat and am installing it with my mazdaspeed exhaust.
Don’t know how I feel about it or how it will sound or if it will cause a CEL, but I am going to give it a shot. I put the MS exhaust and MS intake last night and I am currently sitting in my office waiting for the cat to arrive. I might put it on tonight, I might wait till the weekend. In any case, I will put up pics and a vid on the sound since I have looked all through the threads and could find this set up.
Will let you know.
http://www.rx7store.net/product_p/rx...flow%20cat.htm
Ironically, I am in the middle of this as we speak. I just ordered a hi flow cat and am installing it with my mazdaspeed exhaust.
Don’t know how I feel about it or how it will sound or if it will cause a CEL, but I am going to give it a shot. I put the MS exhaust and MS intake last night and I am currently sitting in my office waiting for the cat to arrive. I might put it on tonight, I might wait till the weekend. In any case, I will put up pics and a vid on the sound since I have looked all through the threads and could find this set up.
Will let you know.
http://www.rx7store.net/product_p/rx...flow%20cat.htm
in order to run a straight pipe, resonated test pipe, or holled cat, if you dont want a cel, get the 18mm spark plug defouler from advanced auto parts, drill a 1/2 in hole through the middle of the top one, screw the hollowed one into the non-drilled one, screw both of those into the second o2 bung, then screw the o2 sensor into the drilled defouler. Make sure all seals are tight and you wont get a cel. I had this done on my 07 civic si for appr. 30k mi with no cel.
04-05-2010, 10:59 AM
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in order to run a straight pipe, resonated test pipe, or holled cat, if you dont want a cel, get the 18mm spark plug defouler from advanced auto parts, drill a 1/2 in hole through the middle of the top one, screw the hollowed one into the non-drilled one, screw both of those into the second o2 bung, then screw the o2 sensor into the drilled defouler. Make sure all seals are tight and you wont get a cel. I had this done on my 07 civic si for appr. 30k mi with no cel.
04-05-2010, 08:25 PM
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im not sure why it doesnt work, thats the extent of my knowledge. I used the defouler with my mazdaspeed protege and it was fine, but other experienced forum members informed that the ecu is too sharp to be fooled by a defouler.
idk about the diode, maybe some other members can chime in...
idk about the diode, maybe some other members can chime in...
04-06-2010, 12:32 PM
#16
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Im wondering why because i had an 07 Civic Si previously and the ecu has to be just as sharp on it as it is on the 8... I mean it took Hondata 3 years to be able to crack into it to be able to solve the tuning issues everyone was having... i had a defouler on it for 20k without a cel...
04-07-2010, 10:38 AM
#18
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The "defouler" as you call it won't work, period.
Why? Here's the answer!
Why? Here's the answer!
04-07-2010, 11:13 AM
#19
That has to be the most scientific thing ever posted on this forum. Because Honda tried to make it unhackable means it must be super awesome lol. Many people have tried the defouler thing and it doesn't work. Some people have just put a test pipe on with no tricks and managed to never get a CEL (or long periods of time anyway). It's a crap shoot. PS: I doubt you will feel much power difference and the sound with a cheap pipe will be raspyyyyyyyyyy.
04-07-2010, 11:16 AM
#20
and you are going about this the wrong way I think...you are talking about cutting apart a very expensive piece when you can buy the pipe with a resonator already in it? Also what is with drilling a hole in the pipe to relieve pressure? That's some ghetto engineering.
04-07-2010, 01:42 PM
#21
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Sorry for the paragraph and run-on sentances...
04-07-2010, 02:58 PM
#24
So here in PA, in order to pass the state emmissions , you must have a muffler and something that could be passed as a catalytic converter ( just has to look like one with a place for an O2 sensor post cat). So i was thinking of ways to stay legal but w/o a cat...
1) Hollow out cat
- pros: less restriction, pass inspection
- con: creates turbulence
2) Test pipe
- pros: straight through, no turbulance, major hp gain
-cons: doesnt resemble a cat whatsoever, fail inspection, get pulled over, get car towed and get a hefty fine
3) Replace stock cat with a resonated test pipe,
like... http://cgi.ebay.com/ebaymotors/Nissa...Q5fCarQ5fParts (although this one is non-resonated...)
pros: resembles cat, straight through design, passes inspection, to the cops eye, when it gets dirty, it will resemble a cat... for the most part... major hp gain.
cons: must cut out cat and weld new O2 bungs, drill hole in bottem left side after put on car to allow the expanded air inside the "chamber," as you will, so it doesnt blow a cheap ebay weld.
Anybody's input or personal exp. with a resonated test pipe?
1) Hollow out cat
- pros: less restriction, pass inspection
- con: creates turbulence
2) Test pipe
- pros: straight through, no turbulance, major hp gain
-cons: doesnt resemble a cat whatsoever, fail inspection, get pulled over, get car towed and get a hefty fine
3) Replace stock cat with a resonated test pipe,
like... http://cgi.ebay.com/ebaymotors/Nissa...Q5fCarQ5fParts (although this one is non-resonated...)
pros: resembles cat, straight through design, passes inspection, to the cops eye, when it gets dirty, it will resemble a cat... for the most part... major hp gain.
cons: must cut out cat and weld new O2 bungs, drill hole in bottem left side after put on car to allow the expanded air inside the "chamber," as you will, so it doesnt blow a cheap ebay weld.
Anybody's input or personal exp. with a resonated test pipe?
- pros: not necessarily, fail.
- con: myth
2) Test pipe
- pros: major hp gain? no.
-cons: you're going to fail with all 3 of your options
3) Replace stock cat with a resonated test pipe,
ebay test pipe..? uhm, yeah. you do that.
