When I first got my 90 GT (140 on the speedo) I passed the 130 mark on the freeway and was closing in on the 140 mark fast when I backed it off. So.... I don't know. And mine was all stock. But anyway my buddy has a full Mac system (93 LX) and it sounds great, he paid just over $700. All I did was picked up some flowmaster 2 chamber muffs and had them welded in. They sound just as good but for the money I don't think I'd do it again. I was in to big a hurry for the sound and ended up paying $240 for the whole thing. I think I could have gotten a lot more for not muck more $$$. But thats just me, that's how I do things.
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