Good luck. In my opinion, a centrifugal is not the smart way to massive power on a relatively small displacement high revving low torque motor. Turbo is the way to go for 1000 rwhp -- and 250% stock power is requires massive work even with a turbo. And that is before you get into tuning.
Look at all the money WiziGuy dumped into his YSi Trim E46M3 before giving up before it was completed. Unless you are a welder and a fabricator with a machine shop or friends who have one, this will be a tough project.
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