Mustang cat-back exhaust...
I believe Flowmaster makes a nice setup for the Mustangs, good mufflers (small), and some nice mandrel-bent pipes. Pricey but worth it to get the sound and power out of the car. The stock mufflers and assorted pipes are the biggest restriction, keep the cats so it runs better/cleaner than a car with the off-road "H" pipe.
In most states it is ILLEGAL to remove the stock cats and drive on the street unless you can prove that a cat has failed, and then you can only change out the one bad cat, not remove all 4 (latemodel) or 2 (earlier cars). The only place you can legally run an aftermarket "H"pipe is at the dragstrip.
And to clear up a misconception, the only sensors in the entire exhaust system is the O2 sensors. There is no such critter as a "backpressure sensor". The ECM does not monitor backpressure in the exhaust, but what you will find is that making exhaust changes makes a difference in how the computer interprets the increased exhaust flow. An aftermarket chip is recommended so you can increase the fuel and take advantage of the new, freer-flowing exhaust.
Last edited by DrChop; 07-29-2003 at 12:41 AM.