When installing a high flow pump, it is all but necessary to drill the factory line to get the most out of the aftermarket pump due to the restriction in the stock line. Due to the inherint nature of a direct injection positive displacement pump, it is possible to disrupt the flow and balance by going to large. The common drill size is 5/64 but we have experimented with a proprietary size to achieve a higher flow rate with out any negative side effects often found when a system is over enlarged.
Core exchange program available for immediate shipping- Refund when a usable, non marred, good shape line is returned. If you are un sure, send me detailed pictures using the contact me.
This has enabled our XDI to flow even more than before!