I have an Edelbrock SDT Muffler that I used for a year then took off to go to a dual system. It sounded great behind my 6.0L vortec and I was going to buy a second one for my dual system but they have been discontinued. Don't know why, it's a great sounding muffler with high quality construction. Part number is 55726. Bought it for $120 on sale. $75 plus shipping. Located in San Rafael Ca 94901