Quote:
Originally Posted by KaWi
I have done the same with my M5 Katalysts but the power on the Dyno was 30Hp less down to 700HP. After this I put 400 cells inside and I get 30Hp plus to 760HP. I think they need a bit pressure after the twinchargers.
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Without tuning to match, it's expected to lose power when mods like this are done. At minimum you should have gotten a stage 2 tune. Google any article about back pressure on FI engines...they want to breath, period.