99GTL30

With the right relays, I would imagine you could use that second wire for just about anything (once you confirm its polarity). Im not sure about your cars (I drive an older Leggy), but this has definately sparked some intrest. Im going to experiment with mine & see if I can get the first push to roll up the windows/ sunroof & the secont to lock all doors & vise versa.

Im an A/V enthusiast & have been for years. Now call me crazy, but one of the best sound/resonance deadeners i've ever used (believe it or not) is spray on bedliner. It takes some effort as far as prep is concerned, but it is way cheaper than Dynamat, easier to apply in smaller areas (spray or roll it on) & helps prevent rust too!