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2010 2011 BMW 5 Series Forum F10 OEM gutted cat vs catless downpipe. |
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09-13-2018, 01:13 PM | #1 |
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OEM gutted cat vs catless downpipe.
2012 535i xdrive pwg.
new to mods and BMW's. just got my jb4 and I wanna go to map 2.. what's the performance difference between a gutted cat and catless downpipe |
09-13-2018, 02:41 PM | #2 |
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It's minor, but an aftermarket catless DP has a smoother path for the air to travel. You probably would not even notice a difference, but I recommend buying a purpose built catless DP.
However, if you gut your stock one there's no going back. I fully plan on swapping mine back to stock before selling it.
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09-13-2018, 02:49 PM | #3 | ||
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I was going to buy a used one from a friend for 150$ gut that one and keep my stock one instead of almost 600 for the catless dp.. the cheaper dp I've herd fitment issues with and no mounts |
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09-13-2018, 03:00 PM | #4 |
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are you just punching out the OEM pipe? i'm actually intrigued on how that's done as I've heard fitment issues with aftermarket DP's.
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09-13-2018, 03:22 PM | #5 | ||
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yea... I'll just punch it out.. |
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09-13-2018, 04:31 PM | #6 |
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Go for it. I just waited for one to show up in the classifieds and found a really nice used Dr. Euro catless DP for $300.
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09-17-2018, 06:33 PM | #8 | |
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In the big picture, your engine and turbo will act much differently now, due to restrictive air pressure against the turbo being gone. Your stock cat creates pressure that pushes against the impeller in the turbo and restricts it from spinning "freely". Due to this you should tune the engine to compensate for that. At a minimum your air to fuel ratio is going to change and you want your engine to run effiiciently.
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03-20-2020, 01:27 PM | #9 |
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So has anyone given this a shot? Would definitely like to hear some feedback.
Seems to be popular with the M5 and other N55 platforms. I may give this a shot myself.
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03-20-2020, 02:25 PM | #10 |
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Not a particularly great idea imo. Catless DP aren't too expensive, the VRSF one is 350 bucks. The stock DP can sell easily for 400. Why not just sell the OEM one, buy the VRSF, and make 50 bucks?
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03-20-2020, 03:16 PM | #11 | |
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Swapping for an Aftermarket Catless DP that could have fitment issues, sounds like more trouble. Making $50 bucks sounds cool, but probably wouldn't work out after shipping and price negotiations. Ultimately, I just need a pipe and O2 bungs, unless I'm really missing something. There really doesn't seem to be an advantage buying aftermarket catless DP. If I wanted to run a higher flowing Cat, I could see the aftermarket making more sense. |
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03-20-2020, 06:53 PM | #12 |
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Been running my catless OEM downpipe for a few years now, on JB4 and MHD, logs perfectly, runs and sounds great...
The de-catted OEM DP, Fitment is perfect, mounts are perfect, and the flex joint is perfectly placed to not put stress on the turbo which alot of aftermarket DP's are missing, along with the mounts. You can find my older threads with information and pics i have posted. The ease of install of the oem DP after you de-catted it, is a breeze! Not even the best aftermarket downpipe will fit as good and be such a easy install.
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Last edited by 5soko; 03-21-2020 at 10:20 AM.. |
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03-20-2020, 07:19 PM | #13 | |
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04-01-2020, 09:48 PM | #14 | |
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04-01-2020, 11:26 PM | #15 |
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There's a video on Youtube with someone who did this. i'll see if i can find it.
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04-02-2020, 12:02 PM | #16 |
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You could look at my youtube videos but I have full armytrix exhaust and mhd stage 2+.
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04-02-2020, 07:28 PM | #17 | |
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It really surprising how quiet even with being catless these cars are, im running oem exhaust otherwise, no drone increased, but alot alot of turbo spool noises! otherwise cold start is louder but driving WOT minimal noise increase.
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