Is there such thing as a performance intake manifold?

[eclou]

yes we are looking at replacing the entire intake, not just the tract from the air filter but all the way to the heads. The intake from the 3.2l 986S was shared with the 2.7l until the 550 special edition which then switched to the 987 style intake. The 987 style intake was also used in the 3.6l 997.

IIRC the 550 was rated 8-16hp higher than the 986s. The 3.2l 987s with improved exhaust then bumped to 280hp. When you compare the 986s intake manifold vs the 987s intake manifold, there are some noticeable differences coming from the heads retrograde to the air filter:

1)intake runner lengths are longer to the heads
2)intake runner volume appears to be larger
3)plenums (not the T piece) appear to have larger volume
4)the T piece has a larger volume (75mm ID) vs 68-63mm mm ID
5)the T piece has a vertical divider in it to split and direct the air flow
6)the throttle body is much larger 75mm vs 68mm
7)the air filter is a oval unit with more surface area vs flat panel

[kias@tampabay.rr.com]

I have the IPD planum with larger throtle body on my 2000 Boxster-S. It works great.

[cheetah]

This is the IPD plenum and larger throttle body on the 3.4L swap that is 99% done.

I do have a 75mm throttle body (stock is 69mm) available now if anyone is interested.

[Cartel]

Originally Posted by kias@tampabay.rr.com

I have the IPD planum with larger throtle body on my 2000 Boxster-S. It works great.

Having installed the greater majority of bolt-ons available for my vehicle, it is fair to say without a shadow of a doubt the IPD Intake Plenum/75mm Throttle Body thus far has been the most rewarding purchase of them all. Coupled with my setup, the intake/tb upgrade is my most recent modification and my most favorite. There is a discernible difference and as I told many others via private message, I have never been thrown back into the seat of my car prior to the installation of any single mod nor collectively! I have well over 2,000 with the modifcation and I find myself looking for reasons to drive my vehicle more, when it already is my daily driver. My only complaint is Road Sport Supply not supplying me with a get out of jail free card due to the fact I was arrested the day of flashing my vehicle with FVD Brombacher's software for wreckless driving!

/e I have been hesitant to make a post since the successful installation of the intake/tb plenum due to all the reservations held by many, and having not putting my vehicle on a dynograph to supplement these gains.