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Had a spare hour or so this evening and after browsing various forums, particularly US based, decided to have a go.

Bit of a ball-ache and a few bruised knuckles but, half an hour later, all done and working fine. No need to remove the front bumper and yes, you can reassemble with the 'horn' but there is a trick involved!

I removed the flap altogether but replaced the solenoid, actuator and vacuum line. The trick is merely to reassemble the solenoid and vacuum line and put it down behind the headlamp assembly, out of the way of the airbox. Drop the airbox down and then by feeling 'out' through the airbox into the horn, pull the horn onto the airbox until it clicks into place. Voila!

Off to the RR at Northallerton with Graeme this Saturday so we'll see what it's like.

Have you noticed any benafits by doing this mod, WOULD you advise it as a worth while?

Dunno - doesn't seem as if it can do any harm.

Anything that gets air into and out of the engine more efficiently should be a good idea. I already have done various things to aid this process and short of a Gruppe M or similar, this seems to be a sensible mod. Cost is free, unlike most things on an RS4!

Cannot discern any increase in induction noise, probably because of my exhaust overpowering everything else. Still, let's see on the dyno.

hey caldy, i did this mod on my car with a k&n drop i filter and i can def hear more noise(nice noise ha). could you share a little more information on your de-vaned inlet manifold. i have a new manifold on the way to get ported a little, curious about your mod

Whilst polishing my inlet manifold, all I did was remove the tumble vanes from the shafts in the inlet manifold and the separator vanes in the top of the cylinder head. It was my understanding that these were to aid low down torque at start up and to control emissions. In my view, they were an interference to air flow which would limit power.

Got any pics of your car - I haven't seen a carbon bonnet on an RS yet!

Should have some pics on Saturday when we are all at our Northern r/r meet.

Voila!

http://i271.photobucket.com/albums/jj12 ... G_2228.jpg

that looks ace

Looks even better in the flesh.

i dont wanna see it... it will cost me more money

Hi P_G, did you end up doing the RR and found any noticeable improvement with the airbox de-flap mod? Did you remove the air horn as well or just de-flap?
btw, your CF bonnet looks great. Mine is phantom black too and can do with one like yours. How much lighter is it compare to oem bonnet?
Thanks.

Hi P_G, did you end up doing the RR and found any noticeable improvement with the airbox de-flap mod? Did you remove the air horn as well or just de-flap?
btw, your CF bonnet looks great. Mine is phantom black too and can do with one like yours. How much lighter is it compare to oem bonnet?
Thanks.