Quote Originally Posted by IntegraXTR
1: yes you can swap the pistons/rods over to the other block, just get them re-ringed first.
2:Its pretty cheap at the machine shop to just clean up the block and head, you could get them hot tanked.
3:The YS1 is the better tranny, those came from the 92-93 DB2 gsr, which has the most identical gear ratio compared to the ITR tranny.
4:250-300whp on stock bottom end aint going to happen, unless you're talking about forced induction.
5:Have a pro do the ecu/tuning for you, or do a little reading first.

hope this helps
There are two Ys1s actually one is the Gsr and the other is a Ls YS1 just tells you what year body style it came from I did a long research process of it.After I went to a junkyard and found 6 ls integras all had ys1.I thought I had died and went to junkyard heaven and thought all of them were b16 I was wrong Ys1 can be both ls or Gsr.