Banks downpipe, although an upgrade over the stock IDIT downpipe, fits terribly and is only 2.75", which is the same as what came on the ats 093 kits. Double checking myself here, I measured the stock exhaust on an obs psd I have at the shop, a stock IDIT exhaust system and a complete diamondeye 4" exhaust I have on the shelf and it looks like although it would seal, the IDIT downpipe studs are just a 1/4" off from the psd flange, so although they look like they would bolt together (the stock IDIT downpipe bolt to the cat delete pipe, and the rest of the diamondeye kit) its just a blonde one off. Although the sealing surfaces themselves would work together, they wont bolt on. However, if you were to use this kit, if you cut off the two bolt flange from the stock IDIT downpipe and the flange on the diamondeye kit, a simple 2.5"-3.5" adapter either welded on or band clamped would allow you to bolt it on without much hassle. If you can operate a tape measure and a sawzaw, you can bolt on this kit to either a factory turbo truck, or a truck with a factory turbo kit installed: https://www.ebay.com/itm/Diamond-Eye-4-Alum-Cat-Back-Single-No-****-94-97-Ford-F250-F350-7-3-Powerstroke/142065597516?fits=Make:Ford&epid=194806450&hash=item2113c4fc4c:g:vV8AAOSwTZ1XlnF3
Of course, this retains the crushed downpipe that the IDIT came with, but I should have a new solution that will eliminate that shortly.