i have a 90 civic si and i am looking to swap for horsepower gains. Does anyone have any good suggestions for swaps into my car that dont require any welding or major changes to engin compartment. Also i would like to use my existing transmission. I am new at all this so all the help i can get would be greatly appreciated. Looking to spend about 1k - 1200 USD give or take at this time. I am vert mechanicly capable of the work but a lot of you guys seem like you have a lot more knowledge about mods than i do. thx guys and gurls P.S. i got a hook up on a d16z6 but sounds like the guy is a bit shady he says its out of a 2k civic but i never heard of that engine in a 2k. Can someone please let me know if i should punch this guy or fork out the cash?