Pros and cons Plenum/74mm Throttle body

[cjmp]

Hi everyone,
I would like to install a IPD Plenum with a 74 mm throttle body on my 2003, 986 Bosxter 2,7L. and would like to hear from anyone experience with this add on performance.
thank you.

[Ckrikos]

I am in the process of doing mine, just gathering all the parts. I haven't heard of anyone complain of any negative outcomes, but would also like to know if anyone has. By the way save 800$ and just buy the 997 plenum.

[Johnny Danger]

Ckrikos is correct. You can replicate whatever the IPD plenum has to offer by assembling the necessary 997 parts for a fraction of the cost. Also, many have opted to use a 76mm TB instead.

[Ckrikos]

I think they are all 76mm, just depends what you are measuring. I bought a 2003 c4s throttle body and it mates perfectly to the 997 v1 plenum.

[jsceash]

Here are some pic of what they are and the differences



The inside has a air divider that stops the dead space as the air hit the back of the plenum body. It also has a cross flo hole to help cavitation.



Diameter is much larger



End result depend on your exhaust, and other modifications. I've used this on a 2.7 base 2003 for 2 years with good results. The big picture is the total package require exhaust and ECU changes, that could net you a nice HP increase. Down side is a nearly equal cost

[cjmp]

Hello,
Thank you gentlemen for your informations and pictures. I am going to pursue the 987 swap.