Quote:
Originally Posted by drive_to_survive
ahem, so 2021 540i here.
Ran a racechip and AA catted downpipe for 7-8 months.
While the initial power bump was nice (especially adding 2 gallons of ethanol to smooth out the car on map 7 of racechip), its nothing compared to a proper tune.
With CPO still remaining, finally decided to buckle up and send the ECU for femto.
Bought the MHD and XHP license, installed the MHD flexfuel kit.
I still remember the initial first pull after the flash.
I was shouting holly fuck in my head with a big grin.
I would acutally push you to go for femto unlock and enjoy your car like you bought something 1 level up.
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Dude, this is gold. I appreciate you taking the time. I’m so close to just pulling the DME.
How is the smell w the AA? Did you go Active or GESY cat?