The advertising would have you believe that larger cat back exhaust systems are a real help on MPG and performance. My experience on two different cars tends to show no difference except for significantly increased noise levels in the vehicle and outside with the sport system.

First car was an 87 740GLE NA. I put a 740 turbo exhaust, cat back. Had to have the cat welded to the first muffler and there are no adaptors. No difference noted except interior noise. Replaced with stock this past weekend.

Next car was a 93 940 T which I put the IPD sport exhaust on. The noise level was terrible. No real changes in power or MPG. Gave it to son-in-law for his turbo wagon and replaced mine with stock. Son-in-law took it off his car and sold it.

Bottom line: Volvo makes a good exhaust system stock. Unless you get into serious performance issues or like noise, stick with stock and save your money.

dick