L33_WRX

I have a performance back box at the mo and thinkinig of adding an aftermarket centre section to make it cat back - What difference will I see if any? Will it make the exhaust that much louder?

Cheers

ScoobyDoo69

iTrader: (17)

Won't add much power, maybe 5bhp? But improves pickup and makes it a bit louder on WOT. I have one for sale at the moment if you're looking for one.

L33_WRX

Thanks for the info and offer but my back box was custom and I am thinking of getting them to chop off where they ended and re-weld from there - they went slightly past the point where a normal back box ends to start with