Originally Posted by Anker (Post 557626)

Its my understanding that its a resonator that cuts down on intake "noise". Pedro's modification replaces the whole pipe that this is connected to with a piece of straight 3" PVC pipe. I plan to do Pedro's modification this winter.

Originally Posted by Starter986 (Post 557627)

The resonator is at the near corner of the pipe before the throttle body. You can see it 6 o clock position of the photo.

The pipe/tube/line/hose in the yellow circle, I believe, isn't capped off. It's leading under the manifold.

Are you telling me there's 2 resonators?

Thank you.

Originally Posted by dghii (Post 557638)

No idea what that is but it doesn't look stock to me. I've had two '98's and the area in yellow is where the MAF sensor was located. I don't see it on your car.

Originally Posted by The Radium King (Post 557643)

tipronic i bet. provides addnl vacuum.

Originally Posted by NewArt (Post 557640)

No, maf would be at 10 o’clock from the yellow circle.

Originally Posted by Starter986 (Post 557645)

Yes. I have the Tiptronic. But, vacuum?

Originally Posted by 78F350 (Post 449393)

...
Quoted from: http://press.porsche.com/archive/products/press_kits/press_kits_2001/PDF/Boxster_in_Depth.pdf

"The Boxster inherits its twin-resonance air induction system from the 911
Carrera. The system acts as a “resonance supercharger,” allowing the engine
to draw from higher velocity airflow at certain engine speeds. A crossover pipe
connects the individual air collector/resonance chambers for each cylinder bank.
A flap in the pipe remains closed from idle to about 3,100 rpm. When it opens,
each cylinder bank can draw from airflow “excited” by the resonance created by
alternating induction between all six cylinders. In essence, “dual resonance”
creates two induction paths for each cylinder. Below 3,000 rpm, the cylinders
draw air from a “short” path. From 3,000 rpm to about 5,100 rpm – when the
resonance flap opens – the cylinders draw from a long intake path, which
boosts torque. Above 5,100 rpm, the flap again closes to allow the cylinders
to draw intake air from a shorter intake path to boost horsepower at higher
engine speeds."

Originally Posted by 78F350 (Post 557667)

A bit of a side discussion... In very simple terms a resonator (that extra appendage looks like an extra resonator) increases the volume of air in the intake tube without making it flow farther. In doing so it acts as a buffer for the vacuum.
In more precise language:
https://itstillruns.com/air-intake-resonator-do-12156112.html

Deeper still is the discussion of intake runner length. A few years ago I was swapping an SUV engine into a small car and noted the SUV had a much longer intake. In simple terms, length mainly effects where the torque peaks in the power curve. Longer tubes make the torque peak sooner:
https://mechanics.stackexchange.com/questions/25236/how-does-intake-manifold-runner-length-effect-the-power-curve-of-a-car

Then there's the 2000 and later M96 engines with the cross tube and resonance flap that can spread the torque peak across a wider range:

Originally Posted by Starter986 (Post 557671)

... You can see that the intake tube wasn't modified for that hose to attach. The hose attaches to the tube, held with the hose clamp. ...

Originally Posted by 78F350 (Post 557672)

The parts catalog (PET) has 5 variations of intake tubing by year/model. Yours looks like is the stock tube for a 1999 and earlier Tiptronic. Here's the parts diagram (M249 is the option code for Tip.):
http://986forum.com/forums/uploads02...1513093933.jpg

Originally Posted by The Radium King (Post 557677)

sometimes i wonder why i bother to reply to posts ...

Originally Posted by The Radium King (Post 557677)

sometimes i wonder why i bother to reply to posts ...

Originally Posted by The Radium King (Post 557677)

sometimes i wonder why i bother to reply to posts ...