with rm2k and want to gain 60hp with n/a engine... u better stop dreaming... with rm2k, the most u can get is about 10-15hp only... building an n/a engine will cost u almost 2 to 3 times more than turbo, and with 4g13 there is too big to expect 160hp... u better do more research and read a lot regarding engine stuff than u will know the reality