Yeah the internals are still stock but everyplace/everywhere I checked says 75 is fine on stock internals. For the fuel line I T'd it off at the fuel line that runs to the fuel rail. It goes from a hard line near the fire wall to a grey thing that looks like a spinning top. The line has a teflon insert so if your kit is NX it will slide over the T but it will be hard to do it. Mines a ZEX and the line was to small for the T so I went and bought some high pressure fuel hose from Autozone and made a new line. I put a clamp at both ends of the line and 2 at the T. It's worked great for me and I've never had a problem with it.