IPD are claiming significant HP/NM improvements in the mid to high rev range.
In the order of 15 bhp ?
I guess I can try it and then provide feedback...

 

i find most of these manufacturer claims to be highly questionable. +10hp for just a red silicone tube? +15 from aftermarket headers alone?? imo, you have to view intake/exhaust mods as cumulative. if you really want to make a meaningful performance change, consider your weaker links along the whole airflow and be willing to address them all. or just resolve to go FI or turbo if you really want to step up performance.

i'm stuck. test drove a 997.1 turbo as potential trade-in and not having a glass roof suddenly felt like a real compromise. the turbo lag was also a buzz kill for me.

anyway, if you do decide to do the plenum, let us know how it feels.

 

I had IPD Plenum installed to my 2011 911S two weeks ago. I feel the mid range Toque pull is stronger. It's well worth the money for that.

Have ordered the FVD headers and 200cell cats, I believe these much less restrictive cats will delivery extra horse power and mid-range Torque. Bottom line, Toque is the area I'm looking for.