The "SR" is the "1JZ" of 4 cylinder motors for Nissan. Lots of guys take a perfectly good 2.4 liter KA out and put in a 2.0 liter SR. Its a very stout motor and 300 RWHP isnt uncommon, I think there are a few here in AZ with over 400RWHP.
I never saw one of those NX2000 souped up, they...