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Razzle the SW update unfortunately does not give the affect you claim. I ran a dyno run just after installing the software which indicated no mid increase and a drop in max power at top end.
Further to this we have tested 4 DIF's and all seem to show a drop in mid but bigger gains at top end, of between 3 to 8 whp.
There is nothing wrong with the Works filter, expensive and does not give 10kw as figures indicate, but still delivers on par with other top performance DIF.
Anyway digressing off the topic, all I wanted to point out is the best whp gain bang for your rands is a DIF. The car is what it is, if its straight line dice you want, the 86 is not for you, but also remember, the road must turn and that's when a real car comes to PLAY.... "GO PLAY"