In Il. you have to have your pick-up truck safety inspected. I think it was once a year don't remember now. I always went to the same place and never had any problems. The last time I went there they had a new inspector. He started my truck with the shop doors closed . He asked what kind of mufflers you got on there? NONE just pipes out the back been that way for years. He scraped off my inspection sticker and told me to get some on there or park the truck. Glad I moved to MI no inspections here. I hate mufflers