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air intake and plenum improvement

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Hello everyone,

Sorry this is a second post as I also wrote in general discussion;

My name is konstantin, I own a NA air cooled Porsche 964 from 1992 and considering buying an RS4 B8, the one with the NA 4.2 L engine from 2012.

I watch the very interesting video by Andre Simon regarding the Air intake.

I am trying to improve my air intake and the plenum on my Porsche 964, and eventually the one from the RS4 NA,

The goal is increase, improve the torque, maybe towards the lower side of the RPM range.

There are a few options I am thinking and you I would appreciate your opinion and experience,

a) Use the AT Power shaft less throttle bodies, providing the could fit.

b) Extend the inlet pipe before the throttle (length to test)

c) extend the plenum before the heads by fitting an accurate size and bore spacer. (length to be tested)

Thanks for your input


hello I'm not familiar with this engine package but generally you will need to add in about 2 inches to the intake runner to see any difference in torque from my experience

Hello Ross,

Thanks for your advise, I was guessing start testing with 60 mm (2 inch 3/8) spacers at the plenum and reduce by 10mm for each run.

I am still wondering if the big inlet pipe lenght before the throttle body could make a significante difference. As long as the filter stays in a coolish area of the engine bay.

Many thanks


a long pipe before the plenum doesn't normally affect it as long as the air is not being heated and is not restricting the flow. as long it has a smooth inner surface you shouldn't see any notable difference


I will be back to repport any improuvement.

We usually reply within 12hrs (often sooner)

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