[ike84]

996 plenums are (as are the ipd) much larger than stock 986 and should therefore allow a bit of easier breathing at higher rpms, if done in combination with additional mods to the intake to eliminate the other points of restriction (tiny MAF housing and restrictive air box). In my mind you either go all the way or youre wasting a lot of time and effort. Even if you redo the entire setup, don't expect more than a small gain in power.

On a side note, I've never seen such a ridiculously overpriced piece of automotive tech as the ipd plenum. The 996 cable driven TB plenums can be had for under $30 and are the same diameter. "oh but the ipd is Y shaped" lol. Pedro thought he could get around their patent and create a similar setup with the addition of an air splitter on a larger plenum and the only dyno run I've seen with that piece of hardware LOST the guy top end power. "Don't forget about the textured lining to improve linear flow " theoretically true, but unless you're doing that to the rest of the intake then this is a total waste.

And this is all coming from a guy who just spent the better part of the winter completely redoing the intake to a short ram CAI with 82 mm TB. I don't regret doing it (this was part 1 of a much larger project so necessary regardless of gains at this stage) but the results are not earth shattering by any means.

Hope this helps.

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