If it was a ZZP kit (uses high pressure EFI tubing and a cooper T), it will fail eventually. EFI hose was not meant to be submerged in gasoline, that and there is no check valve on the "T" going to the venturi pick up - the car needs to "prime" before starting. All be it more of an annoyance, but just something that adds to the list.
I had what you would consider a Car Tuning Kit, mainly just the cross over Y pipe, and PT61. It went through many changes to where the turbo was the only thing left.
436whp on a stock L67 block, 1.9 rockers, cutout, 104 octane, 23psi, 12.5:1 AFRs
On a built low compression motor, it made quite a bit.