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Honestly everything depends on your budget for the time being. If you cant afford to do an rb25 swap in one purchase maybe an rb20 would work for you. Not to go against anything Jeff has to say (He definately knows his stuff, and he is doing all my harness conversions) but for some people a 5-7k swap is a little much. But 3k here then another 1k this month and another a few months later kinda works out better for them (or those who simply cant save large amounts of cash)
You can do a good running 230whp rb20det for well under 4k running. A few months later you can do a mild t3t4 turbo upgrade with fuel and run a MAP-ECU to get rid of the maf and calibrate for much larger injectors for less than another 1500.00(easily capable of 350-400whp). Ive built more than a few shares of swaps by this time. So I can attest to taking your time and finding ways to save a little bit of money goes a long way.
Heres a simple breakdown list with numbers also since everyone else here is doing it:
Rb20det swap - shipped all day for 1300.00 complete (Easily found for under that)
All gaskets and timing stuff - $300.00
Waterpump(n1) - $200.00
Harness - $250.00 or less
Clutch - $400.00
Downpipe - $170.00
Push fans - $100.00
Mount Kit - $300.00
Flywheel Resurface - $30.00
Fluids - $50.00
FMIC kit - $500.00 (hi-ballin that cost via ebay)
Total - $3600.00 installed (if you do it your self)
An RB25 with about 30-60whp more will run you another 1500.00 or more dollars on top of that. Sure the potential is there but for your power goals of under 400whp I wouldnt waste the dough. For another 1500.00 and searching forced induction classifieds like honda-tech you can get turbos, tial wastegates and injectors for dirt cheap these days. And you would make a guaranteed 350-400whp or more if you feel like pushing an rb20 way over its limits.
Anything over 400whp I would do a 1jz or 2jz swap. Costs about the same as an rb25 swap but with 10x the potential.
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