[down4it]

Originally Posted by l4wr3nc3

+1. Not to mention the smell and the black smoke.

You guys have no idea what you are talking about.... I run catless DP's and a catback exhaust, it sounds great and there is no smoke... Your shits weak son!

[ArmyBimmerDude]

Originally Posted by down4it

You guys have no idea what you are talking about.... I run catless DP's and a catback exhaust, it sounds great and there is no smoke... Your shits weak son!

Anyways, I want to hear the answer to Mantis's question. Is it tapered somewhere or all 3"?

[edzilla]

The downpipes reduces down towards the mid-pipe to match the flange, it has to be done that way.

[M3to335]

Im confused...

Whats the advantage of multiple choppy sections with welding vs. one continuous flowing pipe?

[Tonester]

Tight radius bend that no mandrel bender can do.

[Tonester]

Where are the videos? I heard the car in person w/ the DP's installed... SO SIICCCCCK.

[1clean335i]

Originally Posted by Tonester

Where are the videos? I heard the car in person w/ the DP's installed... SO SIICCCCCK.

You should have taken some video if you heard them already!!!!

[BoostedBMW]

Its nice to have another downpipe option.

So, are electronic o2 sims the only option that we have right now to avoid a CEL? It would be so much better if we could get a mechanical fix this way bringing the car in for service without any ECU mods could be done.

[Amir87]

Originally Posted by BoostedBMW

Its nice to have another downpipe option.

So, are electronic o2 sims the only option that we have right now to avoid a CEL? It would be so much better if we could get a mechanical fix this way bringing the car in for service without any ECU mods could be done.

+1

This is the sole reason I don't want to get catless unless there's a mechanical fix for it.

[ni66ale]

how would these compare to RR and UR? im interested in purchasing one of these DP soon but dont know what to choose.

[Sparky66]

Originally Posted by Chowbow

I say go all out and get a flex joint in there like OEM pipes do and do a high flow cat version as well.

I agree with Chowbow about the flex joint. It's still early days to comment but long term use and reliability of any aftermarket DP's is very, very questionable. Only one aftermarket DP manufacturer, called Supersprint Exhausts, have provided a flex joint at this stage.
Since DP's carry the hottest exhaust stream in all the system, it's natural that there will be a lot of metal expansion and contraction going on in there! Welded joints to flanges and pipe joints will need to stand up to long term heat induced movement in this part of the exhaust system.
Having flex joints in each DP is a no brainer and could help alleviate any undue metal stress inflicted cracks or weld failures to the downpipes.
If you think downpipes don't move at all, you are fooling yourself. BMW's engineers knew better and thats why factory DP's have flex joints.
Something to think about.







.

[Mr. 5]

Thanks for uploading those!

Originally Posted by l4wr3nc3

attached for those at work.

It looks great. Just too bad they aren't planning on making a catted version
Attachment 130389
Attachment 130390
Attachment 130391
Attachment 130392
Attachment 130393

[XLR8MF]

Originally Posted by Amir87

+1

This is the sole reason I don't want to get catless unless there's a mechanical fix for it.

If you have an 2008 the sensors are crazy sensitive and mini cats or extenders will not work. I do not see a mechanical fix for this anytime soon.

[Tonester]

HERE IT IS...

I took this vid the other day when I was down @ SP... gotta here it in person sounds really nice.

[Biturbo335i]

Sounds Awesome With The Hks!!

[Chowbow]

Originally Posted by Sparky66

I agree with Chowbow about the flex joint. It's still early days to comment but long term use and reliability of any aftermarket DP's is very, very questionable. Only one aftermarket DP manufacturer, called Supersprint Exhausts, have provided a flex joint at this stage.
Since DP's carry the hottest exhaust stream in all the system, it's natural that there will be a lot of metal expansion and contraction going on in there! Welded joints to flanges and pipe joints will need to stand up to long term heat induced movement in this part of the exhaust system.
Having flex joints in each DP is a no brainer and could help alleviate any undue metal stress inflicted cracks or weld failures to the downpipes.
If you think downpipes don't move at all, you are fooling yourself. BMW's engineers knew better and thats why factory DP's have flex joints.
Something to think about.

Some of the flex can be absorbed by the exhaust hangers, but I think the flex joints will help with tolerance issues too. Heat expansion, a slightly misaligned welding joint (and there are tons of many DPs) can easily be taken care of with a flex joint somewhere in the system. DPs definitely move around... Pop your hood and rev the motor and you'll see the whole thing flexing around on the motor mounts.

[ES BMW]

Originally Posted by XLR8MF

If you have an 2008 the sensors are crazy sensitive and mini cats or extenders will not work. I do not see a mechanical fix for this anytime soon.

Here's an idea... Companies should be responsible and only make DPs with high-flow cats! I'm glad people are having trouble when they run an (essentially) open exhaust with zero devices to clean up the air. It's very frustrating to see more and more companies promoting cat-less DPs while we're having all kinds of problems with the environment. Then they 'think' about making a high-flow cat version.

Sorry, i just needed to rant. <flame suit on>

[e90AW335i]

Originally Posted by My E90

Here's an idea... Companies should be responsible and only make DPs with high-flow cats! I'm glad people are having trouble when they run an (essentially) open exhaust with zero devices to clean up the air. It's very frustrating to see more and more companies promoting cat-less DPs while we're having all kinds of problems with the environment. Then they 'think' about making a high-flow cat version.

Sorry, i just needed to rant. <flame suit on>

errrr..... Do you realize you live in America? The market demands catless DP's so companies will make them, regardless of the consequences.

[Acap14]

Originally Posted by My E90

Here's an idea... Companies should be responsible and only make DPs with high-flow cats! I'm glad people are having trouble when they run an (essentially) open exhaust with zero devices to clean up the air. It's very frustrating to see more and more companies promoting cat-less DPs while we're having all kinds of problems with the environment. Then they 'think' about making a high-flow cat version.

Sorry, i just needed to rant. <flame suit on>

Do alot of tree hugging, i see. Even if everyone running open exhausts were to put cats in it really wouldnt make an earth saving difference, look at the dinosaurs, they didnt run open exhausts and they're not here anymore. We all share the same fate, so while i'm here im gonna enjoy extracting as many ponies from my bimmer as possible, and that means catless. I'm waiting for someone to make dumps so i can run open dp's when im racing and switch back to stock exhaust for everything else.

[e90AW335i]

Originally Posted by Acap14

Do alot of tree hugging, i see. Even if everyone running open exhausts were to put cats in it really wouldnt make an earth saving difference, look at the dinosaurs, they didnt run open exhausts and they're not here anymore. We all share the same fate, so while i'm here im gonna enjoy extracting as many ponies from my bimmer as possible, and that means catless. I'm waiting for someone to make dumps so i can run open dp's when im racing and switch back to stock exhaust for everything else.

They already make generic cutouts if you wanna do that, but you have to bolt them back up when you are done....

[Acap14]

could you post a link?

[e90AW335i]

Originally Posted by Acap14

could you post a link?

Just search for 2.25" or 2.5" cutouts in google. They are made for chevys and fords all the time....