[2Slow.]

Originally Posted by -Vanguard-

Catted. You are driving a luxury highway cruiser, not a rice rocket.

+1
Unless in competitive sport, chasing last few HP, hi-flow cat is just fine. Fit next size up in diameter if you so keen. It will be close to catless.
It will take it longer to warmup, as they are metal based and higher flow. Not much gain down low in rpm range, maybe 100prm earlier turbo spool. But will pick up some HP closer to red line, with tune to support.
Arguably, turbo to cat section of pipe is a lot more important. Design and diameter are the key. Another alternative is to get metal fabrication company to manufacture twin parallel cats assembly, thus halfling back pressure. This works only is space permits. Benefit is that this set up do not throw CEL.

Stock car with tune is much better way to go that to go catless.
My 2c, based of modifying exhausts for some years now.

[Azmentl]

Will high-flow catted downpipe pass emissions? Or is that a lost cause?

[mike@x-ph.com]

Originally Posted by Azmentl

Will high-flow catted downpipe pass emissions? Or is that a lost cause?

The standard catted downpipe is unlikely to pass emission in most states since they trigger the check engine light.

The active autowerke downpipes use EPA-approved GESI cats; you are much more likely to pass emissions with these downpipes. Of course, each state has different laws, so it's not 100%.

[evqr]

Originally Posted by mike@x-ph.com

The standard catted downpipe is unlikely to pass emission in most states since they trigger the check engine light.

The active autowerke downpipes use EPA-approved GESI cats; you are much more likely to pass emissions with these downpipes. Of course, each state has different laws, so it's not 100%.

Hey Mike, is there an AA dp for X5 40i? or is this dp only for the 50i

[mike@x-ph.com]

Originally Posted by evqr

Hey Mike, is there an AA dp for X5 40i? or is this dp only for the 50i

the X5 40i uses the same downpipe as the other B58 models.

I'm not allowed to post links on here, if you cant find it on the website, dm me for the link

[Info@mad-us.com]

Originally Posted by evqr

Hey Mike, is there an AA dp for X5 40i? or is this dp only for the 50i

We have a catless available for your car.

https://mad-us.com/mad-b58-downpipe-...chassis-supra/

[Taserz]

I threw a chinese 200 cell cat for a x5m and got the flange adapter from bmw and oh my god is it grunty and make your jaw drop now

[elite-fusion]

Originally Posted by Taserz

I threw a chinese 200 cell cat for a x5m and got the flange adapter from bmw and oh my god is it grunty and make your jaw drop now

Any CEL light with it?

Do you have a link? And video?

[Taserz]

Originally Posted by elite-fusion

Any CEL light with it?

Do you have a link? And video?

I get a CEL every once in a while I should have done a 300CEL cat. I can post a video later and link it.

[elite-fusion]

Originally Posted by Taserz

I get a CEL every once in a while I should have done a 300CEL cat. I can post a video later and link it.

cool thanks looking forward to it

[toronto_m50i]

i have fi exhaust catted downpipes on my m50i, ended up getting a CEL. its still smells a bit. If i had to do it again i would've gone catless. The smell is no different but the performance gain is noticeable.

[Kobe4Ever]

Originally Posted by toronto_m50i

i have fi exhaust catted downpipes on my m50i, ended up getting a CEL. its still smells a bit. If i had to do it again i would've gone catless. The smell is no different but the performance gain is noticeable.

The ActiveAutowerkes Are the highest quality on the market, I’m sorry to hear you got a CEL, I agree the sound and performance gains are awesome!

[mike@x-ph.com]

Originally Posted by Kobe4Ever

The ActiveAutowerkes Are the highest quality on the market

+1

[Taserz]

For the m50i you can use the same downpipe a x5m has and all you need is the gasket and the v band clamp for each down pipe that connect it to the lower part of it. Look at x5m exhaust diagram and you will see what I am talking aboout. Otherwise it's the same exhaust just for the x5m it's 2 pieces with a gasket and vband and the m50i it's 1 piece.

[elite-fusion]

Originally Posted by Taserz

I get a CEL every once in a while I should have done a 300CEL cat. I can post a video later and link it.

any update on the link to the one you used? or the 300CEL? and video?

[An2610]

Originally Posted by Info@mad-us.com

We have a catless available for your car.

https://mad-us.com/mad-b58-downpipe-w-bracket-bmw-f-g-chassis-supra/

Will CEL pop up with this DP?

[weinerbarn]

Originally Posted by An2610

Will CEL pop up with this DP?

Yes, it’s catless.

[yoandry]

Originally Posted by Kobe4Ever

The ActiveAutowerkes Are the highest quality on the market, I’m sorry to hear you got a CEL, I agree the sound and performance gains are awesome!

Originally Posted by mike@x-ph.com

+1

Yes, but damn $3000 for them.

[mike@x-ph.com]

Originally Posted by yoandry

Yes, but damn $3000 for them.

They use one of the most expensive cats on the market; that's how they can guarantee the no check engine light.

[yoandry]

Originally Posted by mike@x-ph.com

They use one of the most expensive cats on the market; that's how they can guarantee the no check engine light.

If the price is that high to guarantee only no CEL, I dont mind the CEL and pay way less for something with the same or better performance. I have bimmerlink to delete the cel, heck Im doing it every 2 days as I removed the active grill shutters. Im been deleted also the cel with jb4 on my 335i since 2016. lol. I got a lot parts for that build from you. So deal me a good discount, lol.
Now, what other DP variants are there for the m50i that aren't that expensive? Thanks

[mike@x-ph.com]

Originally Posted by yoandry

If the price is that high to guarantee only no CEL, I dont mind the CEL and pay way less for something with the same or better performance. I have bimmerlink to delete the cel, heck Im doing it every 2 days as I removed the active grill shutters. Im been deleted also the cel with jb4 on my 335i since 2016. lol. I got a lot parts for that build from you. So deal me a good discount, lol.
Now, what other DP variants are there for the m50i that aren't that expensive? Thanks

Most would rather invest in a high quality downpipe instead of manually deleting the check engine light every 2 days, but im glad this is working out for you, thats all that matters.

[yoandry]

Originally Posted by mike@x-ph.com

Most would rather invest in a high quality downpipe instead of manually deleting the check engine light every 2 days, but im glad this is working out for you, thats all that matters.

2 days because of the active shutter delete not because DP. Dp will take longer to show. For me as I already need to delete the cel manually, i dont think its good investment to spend 3k on dp just because the cel. I rather go catless. Do you have any other DP options?