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The SOS wiring kit still utilizes the stock connector going through the fuel hanger, which is way too small and will get hot and melt, and potentially cause a fire. Also, the relay setup they have is known to come loose and cause it to also get very hot, enough to melt or potentially cause a fire. Join the boosted s2000 facebook group and you'll see plenty of examples. I included one of many below (not mine, just one from the group). It is better to do it yourself with at minimum 10 AWG OFC wire or larger, with studs or similar to go straight to the pump instead of the original connector. The seamless kit is completely overkill and uses like 6 AWG OFC super flexible wire and comes with good sheathing already, so it's more than you'll ever need. The SOS wiring kit is also like 14 and 16 AWG wires, which is not much bigger than stock.
Thanks for sharing info about that seamless kit. 6 AWG sounds thick AF but for anything larger than a 340LPH pump it's probably good insurance. I've heard of the stock plug melting before when wired with the SOS kit. I had to use slightly larger terminals going into the plug with the 14AWG wire to get a solid crimp on it than the ones SOS provided. A bad crimp (with loose wire strands sticking out) can lead to heat and other issues you don't want. The SOS wiring is a fair bit larger than OEM though.
