Pursuant to Dinan's offer posted here, they've been using my 5/98 1.9 to test fit their prototype CAI; necessitated by the air pump that BMW added to ~1/97 & newer M44s. The production version was installed yesterday. I received the software as well.
According to their website the software adds peak 8bhp & 8lb ft @ 5,500rpm. The CAI adds "X". Good news about the cone type filter…They're now using a different brand (name withheld); which they told me is much thicker, but doesn't sap any power. It's maintenance free; and, expected to last 30K mi.
I haven't spent much time with the car - only the 50-60mi. trip home from Dinan's facilities in Mountain View, CA. Nonetheless, I noticed a slight improvement in acceleration & a nice improvement in it revving more freely, e.g., downshifts = pure finesse. The induction sound at moderate-full throttle is dramatic. "It's good to go!"
I had fun observing the R&D guys load the software and perfect the CAI installation. Steve Dinan was gracious; reflecting his fond memories of racing an 1.9 successfully against ///M3s; and, showing me a customer's supercharged ///MZ3 (400bhp). Details like the carbon fiber valve cover made the engine compartment look *Just Right*. Awesome! Is that customer (Imola w/ CA tags) here? Everyone I came in contact with was cool, and took care in what they're doing.