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      08-10-2018, 09:08 AM   #1
Matticus91
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Talking DIY Catless DP, Success!! Straight piped N55

After this fiasco: https://www.1addicts.com/forums/show....php?t=1523868

I ended up taking the car to friend to help get the DP out since the studs were such a problem. After lowering the subframe, hitting the studs with an acetylene torch & air hammer, and some drilling with a hole saw.......

20180809_171425 by Matt Steele, on Flickr

I can see the light!!!!

20180809_172900 by Matt Steele, on Flickr

Hmmmmm something missing here.......

20180809_181401 by Matt Steele, on Flickr

20180809_181411 by Matt Steele, on Flickr

Quick cold-start teaser before I get some better footage with a real camera. This is with the cutout open, so other than the resonator in the N55 mids, it's basically a straight pipe!

20180810_085838_1 by Matt Steele, on Flickr
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      08-10-2018, 03:19 PM   #2
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Sounds sick! Out of curiosity, how hard was it to knock the guts out? I tried to do it on one of my old trucks with a piece of pipe and a BFH and didn't have any luck...looks like it must not have been too bad on the 1er?
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      08-10-2018, 03:29 PM   #3
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so piped fro mthe dp to the mids?? then from mids u took out the packing on the stock muffler??

any reason why u didn't go 3 inch from the dp str8 to the rear??
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      08-10-2018, 06:48 PM   #4
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Quote:
Originally Posted by elitesales305 View Post
so piped fro mthe dp to the mids?? then from mids u took out the packing on the stock muffler??

any reason why u didn't go 3 inch from the dp str8 to the rear??
Probably doesn't want to be thaaat loud
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      08-11-2018, 09:00 AM   #5
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OP, don't know if you've lived with a catless car before, I did with my Evo and can tell you it isn't worth the trouble. The smell while sitting at a traffic light with the windows down is nauseating, and there really isn't much power to be gained (with the Evo it was 10whp, which is something you won't feel).
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      08-12-2018, 10:20 AM   #6
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Quote:
Originally Posted by BimmerAg View Post
Sounds sick! Out of curiosity, how hard was it to knock the guts out? I tried to do it on one of my old trucks with a piece of pipe and a BFH and didn't have any luck...looks like it must not have been too bad on the 1er?
Thanks! It was super easy to knock them out, I actually used a 1-1/2 hole saw on a drill with a 16" extension and hollowed out the middle of the cat. After that the internals collapsed on itself and it all came out extremely clean. The hard part was getting the DP out of the car, actually gutting the cat took 5mins tops.

Quote:
Originally Posted by elitesales305 View Post
so piped fro mthe dp to the mids?? then from mids u took out the packing on the stock muffler??

any reason why u didn't go 3 inch from the dp str8 to the rear??
Catless DP, OEM N55 mids with the resonator intact (don't want drone), to the stock muffler with a cutout right before the can. When I want loud mode I open the cutout with the push of a button. When I want quiet I close the cutout and maintain some nice raw exhaust note but at a much more tame volume.

Not interested in replacing the N55 mids, not worth the investment.

Quote:
Originally Posted by captain slowly View Post
OP, don't know if you've lived with a catless car before, I did with my Evo and can tell you it isn't worth the trouble. The smell while sitting at a traffic light with the windows down is nauseating, and there really isn't much power to be gained (with the Evo it was 10whp, which is something you won't feel).
I've had catless setups on 3 of my past vehicles, the smell doesn't bother me, if anything it has become a source of nostalgia lol. Also the smell on this car really isn't bad at all, especially with e85 mix, it smells like popcorn!

Also there's a good bit of restriction from the N55 cats, and while the overall power increase might not be extraordinary, I certainly have noticed increased throttle response. All that aside, the sound alone is WELL worth it, I'm obsessed with the new tone and hearing the turbo spool up is amazing!
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