According to ebmods dyno the 2050 and 2060 on the 5port were pretty equal to the 086, 053. That doesn't take into account mileage. The main difference between the 053 and 086 is the 086 is a top end pipe and the 053 is a midrange pipe. Most people prefer the 086 on the 5port since it already has a lot of torque, but some people do run the 053 on a 5port in truggy. According to the dyno when it comes to the 5port you really shouldn't see huge differences between the pipes. To be fair the thin wall of the o.s. pipes would see a good improvement over the thicker walled cheaper pipes, i.e. (dynamite, ofna) but not as much of an improvement over the more expensive 086, 053 i.e. (novarossi, werks)