This is what I am refering too...

Comments:

This engine responds better to tuning than the K20A2, probably due to the better cams and the fact that the stock ECU runs so rich at the top end. A race header, with tuning will provide a significant increase in the mid range and top end torque.

Cams

We have cross referenced the 05 RSX intake and exhaust camshaft part numbers with those available for Japanese ITR.

The Japanese part numbers for the ITR intake cams are:

14110-PRC-000
14110-PRC-010
14110-PRC-020
This is because there have been three revisions of the engine.

The US part numbers for the 05 cams are:

14110-PRC-030 (intake)
14120-PRC-030 (exhaust)

It is therefore our assumption that the cams in the 05 RSX are the Japanese ITR cams. which have the same lift but more duration than the PRB cams


(The 02-04 intake cam part number is: 14110-PRB-020 )
that was taken from Hondata USA website.
http://www.hondata.com/dynok20-05rsx.html

Ok maybe i shouldn't have said the K20A2 isn't as performance orientated.
The K20A2 has all those parts, the K20Z1 (in the 05-06 TypeS) has the same too, and also not only that, it has better cams according to Hondata USA.