D15B2 engine mods

What are the best cheapest mods you can do to a D15B2 engine to get get more HP? I have Cold Air Intake is all.

What all would i need for the MPFI swap?

Want my honest opinion?.... Swap it... Thats the honest to god, best bang for the buck... Even if it is a D16A6... And then mod that... Since most ppl swap them out anyways, u can probably find one reasonably cheap... But if u cant afford a swap, atleast do the MPFI...

http://tech.hybridgarage.com/tech/4gtech/dx-zc-wiring.htm

http://www.angelfire.com/d20/hcivic88/4gtech.html

http://www.geocities.com/teampimports/fuelinj.html

http://www.geocities.com/c_rexboy/mpfi.html