Has anyone replaced downpipe on an active exhaust car?

[RichBrew]

I have a 2019 with active exhaust, and im thinking about replacing the downpipe with a catted or catless one. Has anyone else done this with an active exhaust car? I'd love to hear what it sounds like before i do it.

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[Chef jpd]

Are you going for power of just sound?

 

[RichBrew]

Preferably both.

 

[RichBrew]

Since it’s been a while, I’ll put this out there again....

 

[robertwsimpson]

They aren't too much money... why don't you swap it out and see how it is?

 

[Deleted member]

They aren't too much money... why don't you swap it out and see how it is?

x2 I've been running a fleabay catless downpipe for almost 2 years, no issues with quality or fitment. If you do get one don't overpay for a name brand, its not rocket science to design a downpipe.

 

[RichBrew]

That doesn’t help. I’m intelligent enough to understand that I could try it myself without someone having to suggest it to me on a forum. Obviously I’m not interested in doing that, else I’d have already done it instead of asking the question.

 

[Bear376]

I too want to replace my down pipe. My issue is that I have installed a Roush CAI and CVF intercooler. My understanding is that if I go with a high flow downpipe, I have to install a tune and may need a restrictor on the O2 sensor. Until I can get some answers that I feel comfortable with, I am going to hold off.

 

[kent0464]

I too want to replace my down pipe. My issue is that I have installed a Roush CAI and CVF intercooler. My understanding is that if I go with a high flow downpipe, I have to install a tune and may need a restrictor on the O2 sensor. Until I can get some answers that I feel comfortable with, I am going to hold off.

OEM cats have a 400 per inch cell count, if you get a 3” downpipe with a 300-400 cell count you’ll be fairly safe without a tune and will not through a code. If however you go to a super high flow catted downpipe with a 100-200 cell count a tune is definitely recommended as well as a restrictor for the o2 sensor. If you go catless you must have a tune and a restrictor.
Having said that, I would not run an aftermarket downpipe without a tune, for the safety of my motor and the extra power that can be found with tuning for the hardware.

 

[NickZ]

OEM cats have a 400 per inch cell count, if you get a 3” downpipe with a 300-400 cell count you’ll be fairly safe without a tune and will not through a code. If however you go to a super high flow catted downpipe with a 100-200 cell count a tune is definitely recommended as well as a restrictor for the o2 sensor. If you go catless you must have a tune and a restrictor.
Having said that, I would not run an aftermarket downpipe without a tune, for the safety of my motor and the extra power that can be found with tuning for the hardware.

Hi, I'm running on 3 inch cat back, and planning for the mishimoto catted down pipe...
1st Is it ok that i skip the IC?
2nd Is it ok if I run this set up with out a tune?
Thanks.

 

[NickZ]

Or maybe Krona? That seems to say a tune is not required... Or any lower budget suggestions?

 

[kent0464]

Hi, I'm running on 3 inch cat back, and planning for the mishimoto catted down pipe...
1st Is it ok that i skip the IC?
2nd Is it ok if I run this set up with out a tune?
Thanks.

1. A new intercooler should take precedence over a new downpipe. Cooling the intake charge will help keep your motor healthy as well as potentially aiding power production.
2. Mishimoto catted downpipes come in 2 versions from what I’ve seen, one is a high count cat that doesn’t “require” a tune, the other has a super high flow cat that mishimoto recommends having a tune. Which one do you have?
I personally would not run a larger downpipe with out a tune.....not only for the safety of my motor but also because it doesn’t make any sense to spend several hundred dollars on a performance part and not get that performance.

 

[NickZ]

1. A new intercooler should take precedence over a new downpipe. Cooling the intake charge will help keep your motor healthy as well as potentially aiding power production.
2. Mishimoto catted downpipes come in 2 versions from what I’ve seen, one is a high count cat that doesn’t “require” a tune, the other has a super high flow cat that mishimoto recommends having a tune. Which one do you have?
I personally would not run a larger downpipe with out a tune.....not only for the safety of my motor but also because it doesn’t make any sense to spend several hundred dollars on a performance part and not get that performance.

Ok, I'm looking at the high flow one, I guess I should go for the inter cooler first. So look for high count cat. Got it, thanks!

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