i too have to go with desertwndrr, for an extra $150 you can recore them with the fullsac cores and have a great looking, great sounding, and great performing muffler.I disagree. They are really nice and good performing pipes with a recore from Fullsac. Lots of guys run them and they make great power. The chrome on them holds up really well too. That's why I've bought them. Problem is that it takes another $150 in parts to make them perform so if you pay too much for them them it doesn't pencil. I'd actually rather run these mufflers recored rather than most of the other brands out there.