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[b]Before the air intake modification.[/b]

The figure opposite shows a scan of the power curve Bruno obtained for his car using an unmodified air intake system (but, using the K&N panel air filter). Peak power was approximately 100 kW (134bhp), which appears to occur at around 6250rpm and then plateaus - which tallies well with the data we collected from our panel filter tests found else where on these pages. However, the 134bhp figure seems somewhat low, but for arguments sake, let us take these figures at face value - and assume that no foul play is at hand in terms of 'operator bias'.

(Red line = torque, cyan line = power @ wheels, magenta line = estimated power @ fly wheel)

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[b]After the air intake modification.[/b]

In this figure, Bruno has re-routed the air intake as described above to the left hand side air intake. A K&N panel air filter is also used as before. Now peak power is up to around 109 kW (148 bhp) - a very useful and significant power increase of 14bhp. Peak torque too increases, from the previously recorded 160 Nm (118 lb.ft)  to 165+ Nm (124 lb.ft)  @ 4500rpm.

All very impressive stuff. Even assuming that there is a 'problem' with the base line power figure, there is still a useful gain in power, as VVCs typically record somewhere in the region of 143 bhp, so this is still showing genuine gain of at least 5 bhp, and possibly more.