dude, not tryin to be a dick, so PLEASE!!! do not take it as that..
but you seriously need to do some research, one thing you'll find out on this forum is we do not like spoon feeding people that have obviously not done so, and dont say you did because thats horse shit lol all the info you need is already on here, if you cant find it using the forum search, try googling your question then add sr20 to the mix.
to answer your question, i'd use the stock harness just to be on the safe side.