I donnot agree that you will loose power... I have installed a custom intake, and i did gain power...
Not immidiately, but after like 300-400km, the car started going better, i have tested it with cars i always race with, and the car did much better.
http://www.clio197.net/forum/showthread.php?t=18870&highlight=custom+intake
I second that.
Still running mine (see : http://www.clio197.net/forum/showthread.php?t=16233 ).
Custom cold air intake/open cone filter/pre-cat cleared/100 cell race cat/remap/uprated clutch
So, combination of mods still present; on the dyno after approx. 8000 km's with new engine ('the con-rod bearings problem'), freshly calibrated dyno and hot weather (+30 °C temps) - 98 octane ESSO fuel:
210 HP and 228 Nm
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