Unless you have a KIT... JW or Z1 there would have to be adjustments because of clocking of the char, oil return clearance on DS, etc Didn't mention which Kit or if a kit or using the OEM garrett turbo,, which would make a difference I suspect your not using a Turbo kit ..in which the three bolt adapters for the outlets are at a different clock position. This turns the outlet pipe making it closer to the plenum and a little longer
Nistune Dealer Parts www.aaa-hiperformanceauto.com ECU socketing ECU eprom upgrade