My friend picked up his 87 GT yesterday. It's a pretty nice car, but I'm somewhat concerned. We were aware the mufflers were blown out before purchasing the car. I just assumed it was from age, rust, etc.... However the previous owner told him something along the lines of when he went to start the car one day both muffs exploded, and it was because the car was getting too much fuel because the FP wasn't adjusted. (I wasn't there to hear the guy explain all this to him) When I had my chance to look at the car. I looked under the hood and it still has the stock FPR. I've never saw anything like this before. Both muffs look like someone put some explosives inside each one and set them off. Motor is 100% bone stock, stock headers, stock h-pipe, just an exploded cat back, and gears? Any ideas?