Well I just replaced one on an Altima so it should be pretty close to the same. Just jack the front up put some jack stands under it, then look up from under the car toward the firewall side of the engine near the tranny under the intake manifold. You should see it, it goes into the tranny sorta. Its an expensive part but only takes like hour to two to replace it.
It could be way different on the sr20de but doubt it. but the altima wasnt as bad as I thought.
Take your intake off and put a paper towel in the TB, there is two bolts under the intake that are diagonal remove them, disconect two wires,pull starter out then reverse, three weeks ago I did mine again, and it took 20 mins, I had it out in 2
My friend came to help me and he went in my house to get a drink and use the toilet and when he came out he says what do you want me to do lets get it out, and I said ohhh its out already