[angusvolvo]

Any increased (over standard) power claims should be accompanied by a reputable dyno output graph scan to prove.

It should be noted that cars "lose" horses as they get older.

Quite often mapping / chipping simply replaces those horses that may have 'escaped' - therefore making your car feel 'faster'.

300bhp is a tricky figure to reach with out some significant work beyond simply a 'chip'.

Cheers