If you only want that 300hp mark, then a VF52 and standard bolt on mods (PM me if you want a complete list of what I used) will do it at 18psi with good response and cheaper than using an upgraded turbo. E85 will get you to ~350hp. I'd rather spend the savings on a decent clutch, mine struggled at 300awhp. I've not heard of too many 5 speeds in the gen 3's going bang, I reckon they are a pretty capable unit these days.

If you want to go beyond that 350ish mark, then you are starting to get into built engine / bigger turbo / 6 speed territory.

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