Bhp increase from twin 40s

[mattcogg]

First of all thanks everyone for their advice, I am seriously considering keeping the twin 40s now. I just need a little more advice please. Firstly how much bhp increase will I get? Will I need to change my fuel pump as at the moment my engine is running on a facet electric one as my engine blows any normal fuel pump. Also what other stuff am I going to need I have the dellortos original irmscher inlet manifold and throttle linkage? What is the cost of setting up the 40s minus the price of rolling road as I can get that cheap.

Thanks again
matt :D :D :D

[Will]

Ive heard that the BHP increase is around 15bhp, but then ive heard abt "up to 30% gains" others will know more

U will need to get an alternator bracket made up as it gets in the way of the 40s!!