My 2 pence worth,
you wont measure any gain's from the lighten pulley fitment like wise when fitting a single piece flywheel you wont see a gain on the dyno on a straight pullbut the car will feel more responsive on the road , you can measure these on a inertia dyno but the gians shown would be so small.
Did Paul give oyu a dyno plot of the finished run 1st time laid over the finish run after this work?
The HFC,s still restrict the cars top end but always allow the cars to produce more mid range grunt , the Miltek exhaust will not show a huge amount of gain as the major restriction is the Cats weather they are stock HFC,s , if your running de-cats yes then the stock exhaust will restrict the car car.
I always say the best £ per BHP gain on a DE is the Y pipe/plenum spacer and Uprev , this always gives good returns and the car feels so much better with the throttle restiction removed; If you would of had the whole lot done in one go it would of looked a real good gain the car would of driven totaly different from a stock car.
Running cars on different days will always make a difference and with a roller based dyno repeated runs heats everything up so causing a diffrence in results;
Comparing turbo remaps the N/A re-maps isnt worth even talking about , a remap on a F/I car you turn the boost up the car will always show and feel far faster than a N/A car.