Due to limited floor framing depth, the homeowner would like me to locate the P trap away from the shower drain so as to not require a soffit in the room below. Due to limited headroom above in the shower, the shower pan can not be raised to effectively increase the floor framing depth. The shower drain would connect to a 2" sweep 90 and then run with the required slope to the P-trap, about 5 ish feet, as I understand would be allowed with a wet arm drain to a vented stack. Yes, I understand that even with a wet arm, the P-trap is conventionally below the fixture. Even if this does not meet code, what problems are likely to arise?