Someone fill me in on the K20 engines. I know they are RSX type s engines. Which are about 200 hp.

Which of the K20s produces the most power? Which has the best bolt ons? a1, a2, or a3? I belive its either the a1 or a2...but I dont know exactly.

And with swaping this engine...I heard subframes being used, those have anything to do with the mounts? I dont know everything I want to know yet about engines and thensome,haha. So thanks.