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Old 07-11-2018, 04:33 PM   #1
dinglesrex
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Default Catless j pipe question

So, I have my pro tune coming up early august, going catless for the j pipe and was thinking that since theres no cats, does brand really matter? I mean as long as the welds and steel are quality, wouldn't a catless j pipe be a catless j pipe whether it says cobb, invidia, grimmspeed, 1320, etc. I mean obviously you have the nice stainless steel ones but I don't care whether the pipe is shiny or not, just whether it makes me the hp gains.
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Old 07-11-2018, 04:56 PM   #2
Charlie-III
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I will start off by saying......I am more of a NA guy.......

Once you go CATless, I don't believe the design or brand makes a difference. They ALL need a ProTune of some sort.

Hope you don't need to pass emissions.......
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Old 07-11-2018, 04:58 PM   #3
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Quote:
Originally Posted by Charlie-III View Post
I will start off by saying......I am more of a NA guy.......

Once you go CATless, I don't believe the design or brand makes a difference. They ALL need a ProTune of some sort.

Hope you don't need to pass emissions.......
Nope dont need to pass emissions. I have a few parts stacked up ready to slap on before my pro tune in August
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Old 07-11-2018, 05:08 PM   #4
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some are designed with better curves?
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Old 07-11-2018, 05:50 PM   #5
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Originally Posted by anarekist View Post
some are designed with better curves?
Basically empty pipe, no CAT.......what design?

CATless needs a ProTune, pretty much period. All need a dyno tune as far as I know of.......l
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Old 07-11-2018, 05:58 PM   #6
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Originally Posted by Charlie-III View Post
Basically empty pipe, no CAT.......what design?

CATless needs a ProTune, pretty much period. All need a dyno tune as far as I know of.......l
all j pipe changes need a new tune
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Old 07-11-2018, 06:11 PM   #7
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Quote:
Originally Posted by dinglesrex View Post
all j pipe changes need a new tune
All J pipes, or CATless J pipes?

AFAIK, ANY CATless exhaust NEEDS a ProTune.

Rereading this thread, yes, ANY CATless Jpipe needs a custom tune.
I was more commenting that brand made no difference, CATless did.
Period.

We cool?
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Old 07-12-2018, 12:55 AM   #8
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All J pipe changes need a tune.

There are off-the-shelf tunes for catted J pipes (known as stage 2).

I would recommend a protune, since it makes a big difference, and an e-tune from a reputable shop is pretty affordable.

To OP's original question: I'm not so sure that the marginal difference between brands would be very noticeable, especially if this is as far as you're going. If you're going to upgrade the turbo maybe it would matter.

Last edited by Sarang; 07-12-2018 at 01:01 AM.
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Old 07-12-2018, 08:13 AM   #9
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If the new J-Pipe is catless, it needs a tune.
If the new J-Pipe is catted, it still needs a tune.
Either way, you are changing the airflow so a tune is necessary.

As far as brands and a catless J-Pipe, it really shouldn't matter as long as you are buying a quality piece, and not a cheapo e-Bay piece.

Again, quality steel ( stainless ) and smooth bends are important.
Once you get into catted J-Pipes, then there is more to consider since different manufactures use different cat designs, which can vary flow and noise levels.
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Old 07-12-2018, 02:05 PM   #10
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Lol I understand that I need a tune hence the reason I have pro tune scheduled in August.. That is not my question. Just if it makes a difference between a 200 dollar subispeed j pipe or a 600 dollar cobb j pipe that are both catless since they have no special components. I think I have my answer though.
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Old 07-12-2018, 02:17 PM   #11
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As long as its quality steel and the welds are quality it doesn't matter, like Jack said.

Keep in mind there is zero reason to go catless as the power difference is ~5whp and it invites new problems like boost creep that don't happen when catted. Also that whole environment thing. YMYM

You probably won't have a choice either way as most higher end companies have stopped making catless pipes for the exact reasons I described.
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Old 07-12-2018, 02:56 PM   #12
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Quote:
Originally Posted by GlarryHoodDIT View Post
As long as its quality steel and the welds are quality it doesn't matter, like Jack said.

Keep in mind there is zero reason to go catless as the power difference is ~5whp and it invites new problems like boost creep that don't happen when catted. Also that whole environment thing. YMYM

You probably won't have a choice either way as most higher end companies have stopped making catless pipes for the exact reasons I described.
I guess the reasoning to go catless for me is I can save a little cash and put that towards other parts since I dont have to pass emissions. I haven't heard the boost creep issue before, how does the lack of cats cause that? (Genuinely curious, could change my mind on going catless)
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Old 07-12-2018, 03:27 PM   #13
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Quote:
Originally Posted by dinglesrex View Post
I guess the reasoning to go catless for me is I can save a little cash and put that towards other parts since I dont have to pass emissions. I haven't heard the boost creep issue before, how does the lack of cats cause that? (Genuinely curious, could change my mind on going catless)
Even a simple search should show why CATless DP needs a tune.
Emissions testing may be another.

Also, look at ANY tuner (COBB, opensource, whatever), do you see ANY OTS CATless DP tunes?
Do you see warnings about needing a ProTune of some sort?
Do you see the trend?
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Old 07-12-2018, 03:54 PM   #14
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Originally Posted by Charlie-III View Post
Even a simple search should show why CATless DP needs a tune.
Emissions testing may be another.

Also, look at ANY tuner (COBB, opensource, whatever), do you see ANY OTS CATless DP tunes?
Do you see warnings about needing a ProTune of some sort?
Do you see the trend?
Oh my god. I HAVE A PRO TUNE SCHEDULED. Once again, I AM NOT TRYING TO RUN AN AFTERMARKET J PIPE WITHOUT A PROPER TUNE
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Old 07-12-2018, 04:16 PM   #15
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Quote:
Originally Posted by dinglesrex View Post
Lol I understand that I need a tune hence the reason I have pro tune scheduled in August.. That is not my question. Just if it makes a difference between a 200 dollar subispeed j pipe or a 600 dollar cobb j pipe that are both catless since they have no special components. I think I have my answer though.
It'd matter if the cobb is resonated, as that will cancel out some of the drone.

I'm not an expert on the differences between catless pipes, as I prefer single highflow cat as I want to be a good neighbor. Same reason I have no interest in muffler-deleted straight pipes.

So, you're willing to go catless to save money and b/c you don't have emissions. Okay. Next question: how much noise are you willing to tolerate?

If you say "not a ton", then I'd say you should be doing more research into the proper catback and try and find a j-pipe that while catless is still resonated.
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Old 07-12-2018, 04:29 PM   #16
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Quote:
Originally Posted by dinglesrex View Post
Oh my god. I HAVE A PRO TUNE SCHEDULED. Once again, I AM NOT TRYING TO RUN AN AFTERMARKET J PIPE WITHOUT A PROPER TUNE
Hey, not trying to pick on you, just saying there is NO OTS map that accounts for a CATless DP.
That I know of.
Any tuning solution.
But, I am more of a NA guy.

You getting a tune, fantastic.
Yes, you mentioned it before, great.

As to brand of a CATless DP, they ALL need a specific tune (I believe part of your question).
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Old 07-12-2018, 04:33 PM   #17
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Originally Posted by SirBrass View Post
It'd matter if the cobb is resonated, as that will cancel out some of the drone.

I'm not an expert on the differences between catless pipes, as I prefer single highflow cat as I want to be a good neighbor. Same reason I have no interest in muffler-deleted straight pipes.

So, you're willing to go catless to save money and b/c you don't have emissions. Okay. Next question: how much noise are you willing to tolerate?

If you say "not a ton", then I'd say you should be doing more research into the proper catback and try and find a j-pipe that while catless is still resonated.
I have a pretty high noise tolerance, I haven't really heard a super loud FA motor yet so I am not concerned about noise. Also live in the country so I dont have to worry about upsetting anyone in the morning when I cold start it.
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Old 07-12-2018, 04:40 PM   #18
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Originally Posted by Charlie-III View Post
Hey, not trying to pick on you, just saying there is NO OTS map that accounts for a CATless DP.
That I know of.
Any tuning solution.
But, I am more of a NA guy.

You getting a tune, fantastic.
Yes, you mentioned it before, great.

As to brand of a CATless DP, they ALL need a specific tune (I believe part of your question).
I never had ANY questions about tuning. I mentioned the pro tune part in my OP to avoid these answers which is why I am getting frustrated with your replies.
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Old 07-12-2018, 04:42 PM   #19
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Quote:
Originally Posted by dinglesrex View Post
I have a pretty high noise tolerance, I haven't really heard a super loud FA motor yet so I am not concerned about noise. Also live in the country so I dont have to worry about upsetting anyone in the morning when I cold start it.
Then that $200 piece you mentioned should be just fine. Only thing I'll say about tuning is to either install it when you get to the tuner, or have him give you a limp map you can flash so that you can install the pipe shortly before driving the car there.

That's all.

Sounds like you're set.
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Old 07-12-2018, 04:46 PM   #20
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Quote:
Originally Posted by dinglesrex View Post
I never had ANY questions about tuning. I mentioned the pro tune part in my OP to avoid these answers which is why I am getting frustrated with your replies.
Well, sorry to tweak you.
I also look to others that don't know and guess.
Yes, sounds,like you know are doing it right.

Have fun.

Hey, I have a wife and kids, plenty of options to frustrate peeps, you were NOT on the list......
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Old 07-12-2018, 04:59 PM   #21
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Originally Posted by Charlie-III View Post
Well, sorry to tweak you.
I also look to others that don't know and guess.
Yes, sounds,like you know are doing it right.

Have fun.

Hey, I have a wife and kids, plenty of options to frustrate peeps, you were NOT on the list......
Haha all is good
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