I'm not sure what the benefits are between the 2, but I just got done doing a friends truck an I used the sinister kit which came with a new up-pipe. It came with good instructions, an went together nice. Biggest pita was getting everything apart, reassembly went real easyCan you be more specific? I was looking at the IPR EGR Delete Kit and it had a choice between the two without a great explanation. Little pricey but looks well made. Thanks!