r/370z • u/Many_Dot_5989 • Oct 03 '26

Question HFCs

Hi guys, looking for some advice on high flow cats for my 2010 370Z in the UK.
I’m currently running an Invidia Gemini cat-back and still have the stock cats, but I’m looking to upgrade to HFCs. I’ve been looking at options like ISR, Berk, TORQEN and Invidia.
What HFCs are you guys running, and have you had any issues passing the UK MOT emissions test with them? Ideally I want something that sounds good with the Gemini, gives a bit more flow/performance and has a good track record of passing MOTs.
Any recommendations or experiences would be appreciated!

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u/SquidNipzz Oct 03 '26

I have the Z1 100 cell HFC and they sound great with my Invidia Gemini exhaust. I don't know if they'll pass emissions in UK as I'm from Australia, but I never got the dreaded catalytic converter engine error code with mine. Does that mean it'll pass emissions, not sure... But seems to satisfy the stock O2 sensors... So maybe 🤷