So many people miss the point of the RS2 its unreal.
Its not about peak power, or maximum bhp, it is about a bolt on solution that provides a far smoother power/torque curve & improved driveability, for a fast road car. For out & out power, or high revviness, fit cams instead, but dont expect much pull from low revs, when your in the wrong gear. If you have twice the money of the RS2, & are chasing out & out power, with improved driveability (& sh1t mpg), fit ITB's.
For me, i think those results are decent enough, 174-187bhp.
Not bad considering all you are really changing is the 'matched inlets' to an 'RS2 inlet' - surely proving how good Tom's design is?
My itb'd still did 40mpg