9 1/2 X 4 1/2 X 5 , dry air filter, #21-90035.
Fits very nicely using a 3.5 X 3, 90 degree silicone reducer (slight trimming of reducer). Approx 64% more area than similar conical air filters. Essentially the size of 2 conical air filters, side by side.
Extra air took care of a slight smoking problem I was having with the OEM filter and housing. IAT is slightly higher stopped in traffic, but otherwise it seems the same. Cold air ducting is still in place and keeps pumping outside air when on the go.