Don't use clamps, weld the pipe to the muffler. Stainless is easy to weld and lasts a long, long time.... But as Uncle Bob said, upkeep is a booger. On show cars, I'll go with the stainless but on drivers I used the aluminized tubing, buy an assortment of mandrel bends and some straight tubing and go to it. Before I fire the car with the new exhaust, I clean it thoroughly with lacquer thinner, then run the car and get the exhaust system nice and warm, then paint it with high heat paint...