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Old January 19th, 2005, 12:07 PM   #1
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Thinking of having a custom j-pipe made

I've been reading about the cusotn j-pipes tha tpeople have been gatting made. I think i'm gonna go try and do it. DO you guys have any tips to get the most gain like type of metal, pipe diameter, design or whatever. I'm looking to use Tman's as a model. Will getting rid of all the cats and stuff that he did cause me to fail emissions. ANd will I be able to get teh saem gains 250 whp+ without removing the cats. PLus does anyone know exactly what he did
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Old January 19th, 2005, 12:10 PM   #2
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you will not pass emissions if you remove the cats. you will most likely not get close to 250+whp. you might see like 5-10 hp gain. have you done a baseline dyno? the shop you get it fabbed at should know how to desing it.
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Old January 19th, 2005, 01:45 PM   #3
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Quote:
Originally Posted by deuzezwild
you will not pass emissions if you remove the cats. you will most likely not get close to 250+whp. you might see like 5-10 hp gain.
What he said.
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Old January 19th, 2005, 02:43 PM   #4
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I know two of our members had them fabbed...and I gotta ask

How much was it? Does anybody remember?
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Old January 19th, 2005, 03:44 PM   #5
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I don't really get why more people aren't doing it. I guess wait for a company to come out with one but I don't want to wait or pay the extra $$$. As long as I get some power gainse i'm happy. What do you guys recommend. I realized that I don't care about my emissions. ( as long as I can switch it back to stock before smog test pretty easily). What do you guys recommend doing. (liek removing cats pre-muffler etc) I also don't want it to be ridiculously loud like a semi comin down the road or something.
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Old January 19th, 2005, 06:08 PM   #6
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I went to my local import shop and showed them pictures of Tmans j-pipe to see if they could fabricate the same thing for my car. Well, it was going to cost around $1400, almost the same as Tmans so I decided to hold off for a bit.
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Old January 19th, 2005, 07:31 PM   #7
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I had the whole exhaust done with 2.75 in piping without cats 4 $450 but i had also done it in a group with 3 people.
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Old January 19th, 2005, 07:52 PM   #8
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^^ does that include J-pipe as well??


T-Man's setup cost him roughly a bit over $1k canadian i think. He has removed all three cats, bolt new pipe striaght onto the header.. come down as J-Pipe.. merge.. then Y split at the end for muffler.. I don't remember his piping dimension. he also supposely got O2 emulator thing so his CEL won't come on. and yes, this setup will not pass emission.. (or maybe will in Texas..)
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Old January 19th, 2005, 09:01 PM   #9
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Didnt include the J-pipe but removed 2 of the 3 cats. They gave us a cheaper price because it was more than one car the whole setup whould have originally been around $1350 (estimate). In Florida this is illegal it should be in other places also but always have the check engine liught come on when i start the car.
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Old January 20th, 2005, 12:32 AM   #10
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hey....

yea i bought Tmans j-pipe because he sold his car....brex is right, i got the O2 simulators from him, to aviod the CEL light coming on. The pipe is in storage...will install soon.
Tmans downpipe is also ceramic coated, to prevent rust....as brex said(again) it is direct bolt on so u can remove it to do AirCare or what not, which is what i will do...but our cars are still good for 2 years i think till we gotta worry abou that....I am going to have the j-pipe going to a Magnaflow exhaust system with a glasspack, to tone it down a bit....VERY EXCITED!!!
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Old January 20th, 2005, 12:43 AM   #11
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i would've done it to my 6gen, but i have the freaking pos o2 sensor..
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Old January 20th, 2005, 12:48 AM   #12
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still a noob, so i have noooo idea what a pos o2 sensor is...lol
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Old January 20th, 2005, 01:21 AM   #13
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Quote:
Originally Posted by ib_604
still a noob, so i have noooo idea what a pos o2 sensor is...lol
oh hahah. pos=piece of sh...

and o2 sensor is basically this thing where it measure the amount of gas or oxygen in your exhuast.
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Old January 20th, 2005, 10:55 AM   #14
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hahaha ahhh yes...

so the O2 simulators i have will just immitate that...
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Old January 23rd, 2005, 03:34 AM   #15
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is there any chance i could lose low end power or any power in the rpm range by putting a less restrictive j-pipe in. Same question for having larger piping that goes back to my ca-back exhaust.
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Old January 23rd, 2005, 02:07 PM   #16
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hmmm i think there is a ceratin point where if the pipes are tooo large then yes u will start to loose low end power...but if its just a bit bigger then stock, u are just helping the air flow better....

This is the downpipe that i got---> http://www.v6performance.net/forums/...ghlight=j-pipe
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Old January 24th, 2005, 12:46 AM   #17
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how big of piping should i get for the j- pipe. I think this is what i'm gonna do. j pipe then bigger piping going from j-pipe to the cat back exhaust (but keeping the first 2 cats) then get rid of the 4rd cat. HOw big of piping should I use for all of this? will the shop guy know? what metal ?And will this thing pass emissions. I live in so cal btw so not too much problem with salt or weather.

i'm getting kinda excited AEM v2, borla cat back, custom j-pipe, unichip. maybe i'll dyno after unichip comes out

Last edited by Jliu2k2; January 24th, 2005 at 01:10 AM..
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Old January 24th, 2005, 02:23 AM   #18
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i believe the downpipe connects directly to your exhaust, so no extra piping in between. The j-pipe that i got removes all cats...but if u keep the first to cats that is already restricting the airflow....but with them you will most likely not have a prob with air care. however if u remove the 3rd cat and u go for air care and they decide to look under your car and see u don't have it, they might fail you...but not 100% sure.

as for piping size, i am still new at this so i am not too sure... but if u go to a good shop and tell them what u want to do i am sure they will be more knowledgeable...
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Old January 24th, 2005, 01:50 PM   #19
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Quote:
Originally Posted by Jliu2k2
I think this is what i'm gonna do. j pipe then bigger piping going from j-pipe to the cat back exhaust (but keeping the first 2 cats) then get rid of the 4rd cat.
The car only has 3 cats, not 4!

Specifically, the AV6 has 3 cats (2 close-coupled ones and a common downstream one), a resonator, a pre-muffler, and 2 mufflers.

What?...... whata ya mean?...... what restrictions?...... that sounds pretty free-flowing to me.



Quote:
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ibut if u go to a good shop and tell them what u want to do i am sure they will be more knowledgeable...
I wouldn't count on it. You're giving them too much credit.
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Old January 24th, 2005, 02:30 PM   #20
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grrr meant to say 3


so you guys think 2.5 inch piping for j-pipe and everything or bigger?
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Old January 24th, 2005, 06:55 PM   #21
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Quote:
Originally Posted by Jliu2k2
grrr meant to say 3


so you guys think 2.5 inch piping for j-pipe and everything or bigger?
and shoudl I just cut the 3rd cat or just get rid of them all. Is the third cat the main one then are the 2 close coupled one located on teh piece that the j-pipe would replace.
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Old January 24th, 2005, 08:25 PM   #22
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IMO if u want serious preformance upgrades remove all 3.....

i guess i give them too much credit cause i don't know ****, lol....but yea i guess just talk to people on this forum then....
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