rgs944

I have read most of what has been written on the air box in the search forum but was not able to download the instructions. It seems pretty straight forward. It sounds like four 2in. holes drilled with a hole saw in the front of the box. I assume that two holes go on one side of the snorkel and 2 holes on the other side. Is that right? Any pics would be great. Also at what level should they need to be drilled, towards the bottom of airbox or is just anything below the filter OK. I have the cover to hide them so I probably will not be finishing them with the speaker trim. I know there is some discussion as to how much this mod helps, but even the critics agree that it does do something and I do like more of a hotrod sound. I just don't want to start a new debate on the merits of doing it. Any help would be appreciated.

mikew968

I believe you just center the holes and even them out.

ernie9468

This is how PorscheDude1 did his on the Polar Silver maybe he could give you the holes size & more infos .the holes seem lot bigger then 2" to me.

ernie9468

This is another way to do it but myself I don't really care for it .

rdhayward

I've been very happy with the mod I did:

https://rennlist.com/forums/968-foru...rt-deux-2.html

Still haven't made the 2nd cutout or the pretty ductwork described later in that thread, but I like what I did to the airbox better than the 4x2" holes in the other setup.

rgs944

Thank you guys. It sounds like the most important thing is to just get some extra air in there above what the snorkel can provide. My hood is candidate for a respay in the next few years. I wonder about the possibilities of adding some Turbo look a like air vents to supply some cool air. I know that it probably gets plenty of cool air from the front but I do love the looks of those hood vents.

John Etnier

This is the documentation for the original mod. The accompanying article said they'd found no further gains with larger openings than these. With the 'ports' attached, noise is controlled as best it can be.

rgs944

Thank you John, I was able to download the pdf and that tells me everything I need to know.

Eric_Oz_S2

So what does it add (apart from induction noise) to hp and has it been verified?

richard glickel.

It works. Easily the least expensive 3-4 additional h.p. you can obtain for the 968.

John Etnier

The magazine article from the time the mod was documented claimed more than that:

richard glickel.

We certainly didn't realize anything like that on my 968 racecar. 3-4 h.p. gain on the dyno "before & after". Still, for a couple of holes (4 to be exact) and rubber finishing rings, I was happy to see ANY gain. As the standard disclaimer goes, I suppose "your results at home may vary".

John Etnier

Yeah, well: Flash in the pan, right?

Damian in NJ

Did you have any other gains from cat/exhaust/headwork that may have already gained you some extra hp?

mikey_audiogeek

Doesn't it do away with the ram air charging, since the airbox is now "vented"? I wonder at what speed the effects are negated?