RSD sells the couplers and the gasket last time i checked. They just dont sell the splitter.
PW TMIC always float around but they never come with everything always something missing and the splitter is an important piece i dont get while seller's dont include it. it'd be pointless to sell it then and your left with a paperweight. i bought it without a splitter cause seller didn't have it but i'm not trying to go 350+ just 300+ so i should be fine for where i'm at and just my stock hood scoop