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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Remove cats from stosk DP's?



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      11-14-2012, 11:57 AM   #1
boostbuddy
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Remove cats from stosk DP's?

As an ex Audi 2.7T twin turbo guy, one (cheap) way to go to catless downpipes was to remove the cats from the stock ones.

Anyone done this? Any reason not to?

I'm looking at BMS catless DP's (which are now backordered ), but I wanted to see if this is a vaible option.
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      11-14-2012, 12:00 PM   #2
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I'm sure anything is possible, but I am not sure if the stock Downpipes are 3" all the way until the exhaust.

I think people swap for aftermarket isto get the 3" pipe. Yes it is reduced at the very end to mesh with the exhaust thats 2.5" but aparently the 3" pipe makes a difference. Who knows how much of a difference though.
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      11-14-2012, 12:01 PM   #3
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Quote:
Originally Posted by boostbuddy View Post
As an ex Audi 2.7T twin turbo guy, one (cheap) way to go to catless downpipes was to remove the cats from the stock ones.

Anyone done this? Any reason not to?

I'm looking at BMS catless DP's (which are now backordered ), but I wanted to see if this is a vaible option.
You can do it, but it's not worth the price. The labor etc. Also it's nice to have your stock DP's for emissions etc.

Used DP's can be had for great prices.
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      11-14-2012, 12:03 PM   #4
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Originally Posted by joec500 View Post
Used DP's can be had for great prices.
+1
Even new ones if you go with VRSF cost $315 if your looking for the best bang for your buck. Apparently they fit pretty well too.

http://www.vrspeedfactory.com/vrsf-3...in54ex100.html
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      11-14-2012, 12:34 PM   #5
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You could do it, but you'd have to cut one of the DPs open to get to the catalyst material. Not only that but the stock pipes are pretty constrictive, even without the catalyst material.

Just as a comparison:
Stock:

Active Autowerkes:

I'm not trying to sell you on the AAs or anything just showing you how much better they(or any aftermarket pipe) are.

Also, in CA you need to keep the stock ones to swap out for emmisions testing anyway.
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      11-14-2012, 12:54 PM   #6
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In 2013, no more sniffer test FYI Just OBD Readiness
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      11-14-2012, 01:05 PM   #7
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In 2013, no more sniffer test FYI Just OBD Readiness
Awesome.
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      11-14-2012, 01:11 PM   #8
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It's been done before. However, in hindsight I think most would agree it's just easier to install an aftermarket set and not have to go through so much trouble.

There are other downpipes available if you are ready to buy.
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