You have a couple option for swapping. The b16 series, or the b18 series, are the two most popular and probably the best. b16: 160 hp or 170 or 175 (depends on gen), 1.6 L vtec. high revving fun the drive, easy swap, inexpensive the do/b18c5: 180-200hp 1.8 L vtech22: prelude engine. 200hp. harder swap and more money.k20: lots of custom work but best power. not alot of people have them yet in eks.i would go with the b16 becuz of the ease of swap and its easy to find plus u get a decent hp gain and easy to mod it in the future