So I have a 1999 legacy gt with the 2.5l engine. I installed UEL header and a one piece cat from a 2.5 rs instead of the two separate cats. After that it goes to the resonator pipe and is disconnected at the muffler Flange. The car sounds great but has absolutely no high tones. I was thinking about taking off the secondary cats to get a little more top end out of the sound but I don’t know if just the primary car is enough to let the car pass emissions. Does anyone know?