Drilled Airbox Cover

[Yoda]

Hi. Does drilling the airbox on a 964 really make much difference to the induction roar? I have a standard engine/exhaust which I am happy with as the car currently gets through on even "quiet" trackdays.

Airbox cover seems easy to swap back when neded but I fancy a little more noise for Sunday morning blasts. Is there anything to be weary of when swapping them around eg fitting of filter, sealing unit etc or is it as easy as unoing clips, swap and clips back on?

Many thanks

PS - if anyone has one they would like to sell/dispose of , I have a wanted ad up and am looking for one []

 

[Elliot Davies]

It does make a difference but only when driving it hard, when it comes on cam it really growls []
Around town you wont really hear the difference unless you floor the throttle.

It is as easy as you have stated yourself, a few clips and its off, its a little tight on space the first time you remove it yourself but it is easy.

Some people dont like the roar, the easiest way to test it yourself is to remove the cover and tape the filter on temporarily and go for a blast

DIY............ See Johns http://www.porsche964.co.uk/ technical / engine and transmission / Drill Your Airbox.

Some people bought a spare to drill from a breakers for less than £20

PS. I liked mine drilled when i had it []

 

[Andy Roe]

Quick tip!

Romove your cover & use duct tape to hold the air filter in place. Then go for a drive! If you like it then drill it!

 

[Yoda]

Thanks guys, will give it a whirl without the cover tonight.

 

[Jon Kent]

Otherwise, fit a cup tube to the exhaust.
More of a growl than a roar, but by far the best way to improve the noise of the engine, without getting too loud.
If you leave the standard end pipe, it looks no different to normal, and still goes through the MOT.
I fitted the cone filter from Essential Styling. Again, only sounds harsher at the top end of the rev range.
Not as 'easy' to switch back to standard with this method, but not difficult to fit/remove.

Rgds,
Jon

1990 C4 Cab (with Roock mods)

 

[Elliot Davies]

A little thing to remember.............
A primary cup pipe WITH a drilled or cone type filter may be a bit close to some trackday noise limits.
I put a cup pipe on mine and it made driving the car a lot easier in towns due to the reduced back pressure, never mind the weigh loss []

 

[Yoda]

I'll definitely try the drilled/cut filter as I understand that it isn't so loud outside and for me the advantage is I can retro fit original quickly to get into the quiet track days. Like the sound of a cup pipe but I don't think I could retro fit that when I needed to.

Will try the taped on filter method over the weekend, I am sure I will like it.

Thanks