Dumps also give the car a deeper sound. It is totally different from tailpipes. I took mine off just because I wanted a change and didn't have alot of money at the time. I'm about ready for a change again so I'm gonna put them back on. We have no emission laws in my county now, so that's when I took them off. We had to have them when we had emissions laws though. I think it's just so those lazy people that work there don't have to crawl around on the ground.
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My 94 GT