Catback exhaust vs OPF / CEL

grabbou · Today, 12:39 PM

Hey!
New to this platform and BMW V8s in general, my previous BMW was pre OPF. Does it require a tune to remove OPF? Or we can attempt doing catback without loosing warranty?

matowi · Today, 01:46 PM

If cat-back is OPF-back, it would be fine. You want to keep the OPF in, or risk getting volume/flow CELs (or questions from the dealer if anything warranty-related happens and you fail to have the opfs where they should be)

grabbou · Today, 02:17 PM

Thanks! I had a quick chat with one guy from Austria who claimed to be driving a proof of concept of Remus cat-back exhaust without CELs, which got me thinking there could be a different sensor situation on G90, than e.g. other cars, where it usually throws CEL otherwise.

Today, 12:39 PM	#1
grabbou Private 8 Rep 53 Posts Drives: 296 GTB, F8, E46 M3, S560 Join Date: Aug 2017 Location: Europe iTrader: (0)	Catback exhaust vs OPF / CEL Hey! New to this platform and BMW V8s in general, my previous BMW was pre OPF. Does it require a tune to remove OPF? Or we can attempt doing catback without loosing warranty?
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Today, 01:46 PM	#2
matowi Major 1145 Rep 1,022 Posts Drives: '24 X5 M60i Join Date: Sep 2014 Location: Poland iTrader: (0) Garage List 2024 X5 M60i [9.50]	If cat-back is OPF-back, it would be fine. You want to keep the OPF in, or risk getting volume/flow CELs (or questions from the dealer if anything warranty-related happens and you fail to have the opfs where they should be) __________________ Have: '24 G05 M60i Had: '15 F10 535d; '21 G11 740d
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Today, 02:17 PM	#3
grabbou Private 8 Rep 53 Posts Drives: 296 GTB, F8, E46 M3, S560 Join Date: Aug 2017 Location: Europe iTrader: (0)	Thanks! I had a quick chat with one guy from Austria who claimed to be driving a proof of concept of Remus cat-back exhaust without CELs, which got me thinking there could be a different sensor situation on G90, than e.g. other cars, where it usually throws CEL otherwise.
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