Man I am happy. I put the new muffler on and was sad. She still wanted to backfire. So I went threw it one more time. One wire on the firing order. Well two really. Crossed! I switched those two and , Wow, smooth ruuning and good sounding truck. Its best to check everything twice or even three times. I sure wish I was a machanic. This is fun when you get something right. Next the mighty brakes. For all those who gave me ideas. Many thanks Luther...