You don't need the fuel pump unless your going to be running 15+ psi. If your hitting fuel cut then yes its time to upgrade to the walbro. A j-pipe is more for a front mount setup. If your still running a sidemount you'll probably need to run a 1g compressor outlet pipe which faces in the direction of the smic. Don't know if it would actually work on the 2g sidemount without modifying the lower intercooler hose. You don't need supporting mods to run the 16g it just all depends on what psi your running and how hp your wanting.