To improve 'noise', drilling holes in air box was 'de rigeur' (sp?) when I owned my last 964 10 years ago.

You guys still doing this? I remember it made a brilliant difference when accelerating and was planning to do it again.

Any reason not to?

 

The difference between a stock airbox and the Cup airbox is 3hp on a chassis dyno. Drilling holes would then be between 0 to 3hp.

 

I'm running with the stock airbox cover - I like to think it keeps the filter cleaner and drier. Besides, my primary muffler bypass makes plenty of noise!

 

Geoffrey,

how would those horses be distributed? Any lows loss?

 

its basically just moving the curve up with the peak being 3hp.

 

I have the Fabspeed "964 CUP High Performance Air Intake System" (one big hole) and love the sound with wide-open throttle.

Doc

 

Cool sound at WOT is all you get. I returned to a stock airbox from a K&N cone setup but I would like to have another airbox half to drill and play with.

 

Any DIY's on drilling the airbox? Pics?

 

just buy another airbox cover from ebay or oklahoma foreign and cut it like this for the Carrera Cup Air Box

http://www.carreracupusa.org/Race/engine/engine.htm

as far as drilling it - just apply a 1-2" hole saw liberally across the face of the airbox cover (outer only)

 

I will exchange my drilled air box with anyone that has an intact one.

 

Ditto.

You beat me to it!!

 

I have a Cup style cover done in Carbon Fiber and a stock one.

the open (Cup Style) has a much better induction sound. Especially over ~3K RPMs

 

I have an intact one and, as I'm new, it should be fairly easy to pull the wool over my eyes, but...if all I get is a cooler sound and more BHP, why wouldn't I want the drilled one (except it's not stock)?

I may be game for a swap.

Matt

 

Springer3 and Dfinnegan,

I have a spare airbox cover (intact) that I was going to cut open, cup car style. But felt bad about destroying a perfectly good Porsche part. If either of yours only has holes on the big side, so it can still be cut to look like the one in the link Cupcar#12 posted, and you would like to trade, shoot me a pm.

Cool,
James

 

Have a look here...
www.porsche964.co.uk