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Fueling is a big issue with the n54 platform.
There isn't much available for the e89.
I am running 30% eth. Dual 7GPH meth Nozzles. The LPFP was swapped out for a Walbro 450. With all this, the car is good for 600whp. I ran the same fuel setup on my bottom mount single turbo 335i and it also held 600whp just fine. The more Eth you add the harder your pumps have to work. When I swapped out the Eth for 98 (and higher) Ron fuel it did wonders for the HPFP and the LPFP. With just race fuel in the tank, I think 650whp might be achievable with a Walbro 450 and a dual meth nozzle setup. Time will tell.
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