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From my own experience when i had this exhaust its great for the money, the gains felt in the higher RPMs were phenominal. Although i have no dyno sheets for proof but i have a baseline race with a bussy of mine also with an S. Before i got this exhaust he would slowly pull on me at higher speeds when we would get on it, but after i installed the exhaust i would pull on him harder than he would on me before the exhaust. But then one day the welds on the exhaust broke......long story short, good gains but you get what you pay for.