Hi... so I have to replace my exhaust... anyone with emissions pass with a x or h with high flow cats?? I can just bolt up my old pipe for the emissions... but anways.. I like a deep tone.. so I have heard x's aren't right for that.. but would x's with two high flow cats still be higher pitched??? or would the cats give them that lower tone like a h... I was thinking of a pro chamber from mac.. but am really unsure... have enough to buy one but confused.. have bbk equal length shorties.. I don't really mind it loud.. but deep not high pitched.. performance wise is a x better than say a prochamber.. (offroad).. oh and anyone know much about backpressure.. thought I heard once that it can be good... low vs high end torque... low vs high end hp... any h pipe or prochamber or x performance comparison would be awesome!! thanks guys!!