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Will you have 400 whp with all those parts plus a custom tune? No.
However, you will definitely have 300 whp, same as a stock 335i.
But...All of those parts (plus labor) will definitely cost $7000 or more. At this point, you might as well have sold your car and gotten a similar mileage/condition 335i.
THERE IS A REASON NOBODY DOES EXTENSIVE PERFORMANCE MODS on 325/328/330 E9X cars. The value proposition is not there.
I have an LCI 328i. Only mods are a Rogue Ikon exhaust, BMS PBX, and a charcoal delete and I'm happy with it. If I wanna have a little more fun, just slap the gear shifter into DS mode.
THE BMS PBX combined with DS mode really awakens the car. Some folks may beg to differ. But that's just my 2 cents.
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