If i was you i would just make the little extra trip to the acura dealer and get the specific wires, just get 2 sets and save another trip. The gs r is a 1.8l, Si is a 1.6l, you might not get the spark that's recommended for the extra 2 liters. Then it might cause backfire and fuel delivery problems. I'm not that sure of it tho so no quotes on it, and almost always when buying from dealers shits going to be way expensive. Just go to a local auto store, i know a nappa at my old place that sold 9mm ngk's for 40 bucks.