best bang for your buck to make 400whp is a rb25 with a decent turbo..I did a 2jz swap in to my car over the winter, and dont get me wrong, I love it. but for the money an rb with like a 35r or similar is an AWESOME setup. (one of my buddies has it and it just works). A 2j swap is expensive, lots of custom stuff, and everything for a toyota seems to be harder to find and more expensive. With an RB becoming more common there is much for information out there about the swap.
Don't rule out KA-T. I had just shy of 400whp on a very streetable KA-T
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