I made over 500whp with my SR20DE Silvia motor.. Just a set of pistons and rods and it's good to go. Hell, you could even swap in some stockers from any SR turbo motor. I paid 500.00 for a non-turbo S14 SR20DE swap.. complete. I spent a grand on internal mods.. Paid less than a DET swap, and have a way stronger motor.
Was it worth it? 512whp @ 5500rpm, before the rear end broke. Still had 2000rpm left to go too.

650whp is in my grasp.
Travis