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This is very much the position I’m in. RIS due next week. The OPF’s are coming off! Once you’ve heard the M3/4’s then keeping the stock midpipe (source of silencing) isn’t really worthwhile.
BM3 seems to be the best option. I’ve asked various well-known UK tuners and prices vary from £600 through £2k plus depending on just removing the OPF sensors from the software, through to stage 1 tuning 500hp+.
From what I’ve read, BM3 OEM CS tune doesn’t look for the OPF sensors so can be good to go. Alternatively, you can raise a ticket with PTF and they will be able to apply a fix to delete the OPF software from whichever map you choose.
I’d be happy 460hp (CS) map in all honesty. Just anything to get rid of those filters...
Edit: make sure to remove the OPF’s from the ECU before changing the exhaust. Once the filters are removed, any WOT over 5k causes limp mode.
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