Man you guys need a neewbie section so people like me can ask 10 questions a day

Ok todays Ian is maybe sorting me a cat back, after some searching the centre pip on mine has no cat just a small silencer. Is it worth repalcing?
I assume the power gain from 2.5" to 2.5" non resonated centre pipe will be what 2bhp at most?
Im not after power as i said before just a nice tone from that boxer engine would you agree im just better of with a back box or have i missed something on the centre pipe?

 

a non resonated centre pipe will deepen the grumble and a make it a bit louder, mostly deepen it though.