yea theres tons of bolt ons u can do, an internal work.. such as a different head, u can put on a vtec head or port an polished head.. but id jus do a b16 swap or if u dont have the money a zc.. ne motor is better then the d15/16 whichever u have in it.. an the money ur guna pay for parts an labor for internal/head, u culd put in a ZC or for a lil more a bseries