We successfully changed our exhaust today at home! Fellow FChater, Jim Hilton, came through as promised with the 348 spyder exhaust for our 1991 348 ts. It took about 3 hours to switch out. The new exhaust sounds louder and better, but isn't up to Tubi levels. Probably the biggest gain is that it is half the size of the old one. Halfway through the project, we took the opportunity to fire up the car without any muffler. I thought it sounded great. But my retired neighbor cast his vote otherwise. It was amazing how fast his garage door went up and he was out in his driveway casting evil glances our way. Plans for the old exhaust are to circumcise it into a "challenge" exhaust. We took off the heat shields. Do you think it is ok to leave them off with this new exhaust?