10-15-2019, 07:26 PM | #1 |
Lieutenant
153
Rep 414
Posts |
N26 w/BM3 stage 2 & secondary cat
I’m wondering if there is any risk/increased wear to my turbo if I’m running BM3 stage 2 with an ER high flow DP but kept the secondary cat and remaining stock exhaust components in place. The DP is 200 cell and secondary cat is 400 cell. This is basically the same restrictions as the factory N20 DP which BM3 says to replace with high flow or catless DP to not wear the turbo on stage 2. Should I be planning a cat delete or because the secondary cat is further down the exhaust it doesn’t impact the turbo? Have 20k miles on my car and would like to keep it for another 5 years or so running stage 2 and not planning any more mods.
Any info to prove/disprove my concern is appreciated. 328ix LCI 8AT Sport Line N26 | OCC | VRSF 5" HD FMIC | ER CP | ER Catted DP | BM3 Stage 2 93
__________________
328ix 8AT Sport Line N26 | Navardi Custom Stage 2 93 | xHP Stage 3 | VRSF 5" HD FMIC | ER CP | ER Catted DP CTC | aFe Pro Dry S | MST Turbo Inlet | TMS Upper Air Intake Tube | 2nd Cat X | GFB DV+ |
|
10-15-2019, 09:13 PM | #4 |
Brigadier General
2000
Rep 3,680
Posts |
You can run stage 2 with the secondary cat in place. Ideal would obviously be full catless, but if you want to keep that 2nd cat you can.
__________________
Instagram: rjd_f30 | Current: EBII 2013 335i 6MT RWD & Sprint Blue 2008 Audi RS4 | Retired: 2013 328i, 2000 XTerra, 2022 Civic Si |
|
Appreciate
1
GreenF30N26153.00 |
10-15-2019, 09:47 PM | #5 |
Lieutenant
153
Rep 414
Posts |
Thanks. If I were to go to a custom muffler shop and get the secondary cat deleted any idea of the gains? I don’t want to do the full mid pipe as that ends up being $1000CAD plus install. Trying to use math on gains+turbo reliability to cost. Assuming not much gain or increased turbo wear I’m likely to stay as is. I went catted DP so there would be no fuel smell. Not trying to open that debate but I have no smell at all as is.
Last edited by GreenF30N26; 10-16-2019 at 07:59 AM.. |
Appreciate
0
|
10-16-2019, 02:23 AM | #6 |
Captain
242
Rep 804
Posts |
I'm in the same situation too. I have vrsf downpipe and wanted to delete the secondary cat so I asked what the difference in power gain would be. some people say 5 to 10hp gain but there is no evidence.
|
Appreciate
0
|
10-16-2019, 07:10 AM | #7 |
Lieutenant
242
Rep 420
Posts |
dude.... any competent muffler shop can delete the secondary cat for around $50...
You could even weld a resonator in its place for not much more... |
Appreciate
1
GreenF30N26153.00 |
10-16-2019, 08:10 AM | #8 |
Lieutenant
153
Rep 414
Posts |
Agreed that it would make sense removing the cat would add some HP. Similar logic for high flow cat vs catless DPs. Small difference but still there. Would need a few dyno runs to prove it.
I’ll check on the local boards to see if anyone near me has done a 2nd cat delete and the price. Thanks for the feedback all. |
Appreciate
0
|
10-21-2019, 11:23 AM | #9 |
BimmerPost Supporting Vendor
24199
Rep 190,807
Posts |
No risk running stage 2 as long as primary cats have been removed
__________________
Check out our current sale by clicking on this link!
https://x-ph.com/sale/ Phone number 702-494-9435 |
Appreciate
0
|
Post Reply |
Bookmarks |
|
|