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DCrz38 DCrz38 is offline
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Join Date: Aug 2020
Car: BMW 335i 2007
Default MHD Stage 2 - Secondary *****s? - 08-19-2020, 09:27 AM

Hi all,

I've owned my '07 335i for about a year now. It's running stage 1 MHD with DCI and a full ct-back with resonators in place of the secondary cats.

I was wondering if it's possible to run stage 2 MHD with the stock primary cats in place, but with the secondary cats removed? I'm a bit hesitant to run no cats at all due to MOT issues (UK-based).

I was considering HFCs but again, I don't think it'll pass MOT without secondary cats and I really cannot be bothered changing them every year.

Appreciate any input, thank you!
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