I will have to get it on the dyno but I am sure this will add at least 25bhp. I think it looks great and will no doubt add £100's to the value of the Monaro.
My wife bought me that really cool upgrade when I bought my CV8.
Unable to install them yet as I'm unsure as to how much they'll raise my insurance premium. Apparently Pink are the hardest to insure as they clash with the Yellow paintwork and disrupt police camera van cameras.