I'm currently in the process of slowly putting my system together in my st1. so far all I've changed out as the front woofer and tweeter. I used the JBL GTO 609 c. It is a component set. You can get them for about 80 bucks affair woofer Tweeter and crossovers. I plan on installing components in the rear doors also I'm just flush mounting it sweeter in the position where it would be in an st3. It's marked on the back of the door panel.I will tell you since putting in the components that in the front just still hooked to the stock stereo and it sounds so much better.I'm almost considering not installing my 4 channel amp and using that for speakers I could mount in the hatch for when there's a party. Slayer, Slipknot, Lamb of God they all sound great. Granted there 6 and 1/2 so there isn't much low bass from them. They definitely have some mid bass punch and they're still off the factory they should really kick a$& with 10 times the power. There was one set on eBay the other day for $65 with a damaged box.