I just put the prl rbc manifold on and I know this sounds weird but my heater won't work on defrost?? And also the car feels like it has no balls at all. Also at about 45-50mph im feeling a hesitation. Now I already have a p0171 which is a bank 1 system to lean but I had the same code after I installed the down pipe and exhaust but I didn't feel a loss of power? Has anyone had any issues when installing the manifold?