[Darryl]

Found these a few minutes ago...requires a 2 1/8" hole exactly per spec. I just got some so I can do the coupe and got an extra set of 4 to have on my shelf if any local guys need some air box cuttin'...

http://www.speakerbuildersupply.com/servle...rt-tubes/Detail

- Darryl

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[kwikt]

Wow, that's a hell of a deal!

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[968Z]

They ain't got but 3 left!

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[Darryl]

You're right...I was going to get another set of four, but they were one short, so I figure I'll wait for them to restock...maybe an e-mail to them in the meantime to see when (if) they'll get more.

- Darryl

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[dlearl476]

Finish mine today. Nice sound, nice feeling in the butt-dyno. [img]style_emoticons/<#EMO_DIR#>/wink.gif[/img]

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[Fox944]

i cant stress enough how great of a modifiction this is for 968's in any state of tune.

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[Walker18]

Thanks for the heads up on this simple but effective mod! Just called Pete at RS Barn, said he has the tubes in stock, so I'm good to go, and a great quick project for the winter time. [img]style_emoticons/<#EMO_DIR#>/biggrin.gif[/img]

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[dietrite]

This is why I signed up for Forum. Even though I don't get a chance to get on that often. I guess I'll have to get a subscription to 9 now that I see what they have to offer.

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[blau]

Picking up my 968 next week and looking forward to making this my first mod...Thanks for the upload!

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[Ab54666]

I'd like to do this mod but struggling to find any tubes in the UK....... <img src="/forum/images/smilies/968/sad.gif" class="smilie" alt="" />

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[DaveN]

I'm pretty sure the UK has indoor plumbing now, I was there in 88 and I didn't have to go outside <img src="/forum/images/smilies/968/laugh.gif" class="smilie" alt="" /> All you need is an ABS plumbing adapter, no special tubes required. I just went to the hadware store and picked up 4 - 2 1/4" adapters. They cut and shape easily with a saw and coarse file.

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[flash]

not necessarily true - the entry profile and curvature makes a big difference in both tone and in flow - it isn't just an aesthetic thing - the more curvature, the better for flow - square corners are BAD



i haven't seen the ones you are talking about, but you want at LEAST a 1/4" radius at the entry

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[AJG]

Reading what Flash was saying about the radius entry on the airbox mods and he's right and it made me think about years ago when a loudspeaker manufacturer filled the port tube for bass speaker loading with straws(!) to linearise the flow and reduce turbulence. Also it might be an idea to also radius the tube's inside edge also to minimise diffraction of the air flow. Haven't stuck my nose into the the airbox but if there is enough depth, lenghtening the tube should also help smooth the airflow. Can the holes be drilled without removing the airbox from the car?



Andy

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[flash]

drilling - i doubt it - not a lot of room there - removal is easy though



longer ports - no room



radiusing - did it - i didn't bother to measure any change, and just trusted the physics

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[pinball1008]

Ab54666 see PM ref tubes in the UK <img src="/forum/images/smilies/968/smile.gif" class="smilie" alt="" />

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[Ab54666]

[quote name='pinball1008' timestamp='1296762760' post='104562']

Ab54666 see PM ref tubes in the UK <img src="/forum/images/smilies/968/smile.gif" class="smilie" alt="" />

[/quote]



Thanks for that.

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[AJG]

Just how much room is there internally Flash before you come up against something? As I'm thinking about having a two piece insert with a plastic nut type fixing internally and an "o" ring on the outside against a lip. I could easily mill some of the external rib structure away to allow this.



Cheers Andy

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[flash]

not much - maybe a bit over an inch at the bottom - remember that the air has to have room in there to move or you will create more turbulence than if you left the ports off altogether



there would be more if not for the internal ribs, but they act as a helmholtz absorber and really quiet things down

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[986boxster1998]

Supplemental information about the mod: I recorded maximum cabin volume before and after the mod doing several runs. Turns out with windows up and sunroof closed I registed 103db before the intake mod and 109db after. The before was completely stock with the K&N filter only, while the after had the filter and the holes drilled to specifications in instructions (no trim rings).

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[DaveN]

And what a wonderful 6 dB it was <img src="/forum/images/smilies/968/wink.png" class="smilie" alt="" />

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