Are vette's THAT bad about loosening up? Anyway, I obviously have not had the car long enough to give a solid opinion on the '05's ability to keep it together but I admit I have similar concerns. I bought mine off a lot and got the shaker 1000. I didn't want it but in December GT's were hard to find so I took what I could get. The problem is, I like my music LOUD and I've grown quite fond of my "shaker". I'm concerned that all the bass will loosen up the rear and I'll end up with one of those old beaters that rattle like a Texas diamondback. That said, I owned an '88 GT and I can tell you; this is a MUCH better built car. I hope the better quality materials and better constuction thruout will head off the problem you speak of. And before the fox guys get pissed let me say, It's a better designed and built car but I did'nt get it for anywhere near the $14,500 my '88 went for brand new.