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-red top SR20DET's are from S13's. black tops are from S14 & 15's. there are also black tops in 180SX RPS13's. they are the same as red top S13, not S14. S13's make 202hp; S14's=217hp; S15=247hp. an S13 would be best value @ about $2000+install. the rest are kinda expensive and have little benefit; S14's just run the T25 harder and S15's have a T28, still pretty small; and it'll cost twice as much. the six speed also makes the S15 install VERY tricky. their only disadvantage is their aluminum block won't hold more than 450hp for long.
-the RB25DET (skyline GT-S, not GT-R) isn't too hard a swap, but is a little more involved. but with a whole front clip you should be ok . they are quite a bit heavier, require more work for install (though not too much custom, contrary to popular belief) and cost about $3500 on their own, but have way more potential than anyone could realistically use on the street.
-a good compromise is the KA24DE (stock engine). surprised? with a $3000 turbo kit you'll have about 250hp and an easier install than either the SR or RB. plus a T04 and FMIC, so you won't need to spend $ on them later. all you need after that is fuel & engine management for 300hp+. then build the internals and it'll hold 450hp+ easily. cheap compared to an SR swap bc you don't need a swap, a bigger turbo, or a new intercooler. plus it won't leave you wearing your block. the downside? hmm...i don't know...it's not "JDM" i guess. but i say screw JDM, i want as much power as i can get for as little money as i can spend.
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KA=Kick Ass
SR='S'all Right...
RB=Righteously Bitchin'
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