I have run the promo kit grp pipe and it comes with a short header. This is fine in a buggy but in a heavier truggy the grp's need a long header to increase the bottom end. Ninja makes a long headed for the fls type pipes otherwise I like the Rb long and short headers to go with the dynamite 053 and 086 pipes. The grp 2053 pipe does get better mileage. I am breaking in a new grp .28 powerhouse mod today and I fear that engine will need all the help it can get in the mileage department so I am trying the stock grp 2053 and short header hopefully it will get atlease 9 min.