I blew my 99 civic Ex engine and since I am putting in a new one i figure i should add I/H/E, hi-flow cat, and an underdrive pulley. Im just waiting for them to come in now. The questions are...how much horsepower could i hope for....MAYBE 20hp? also, since the engine will already be out of the car, how much should i be expecting to pay for these components to be installed?

ps. please spare me the "forget that and boost" or the "forget that stuff and do an engine swap" comments. Thanx