Quote Originally Posted by aaronng View Post
The heads are the same. I reckon the difference is through ECU and maybe cams. It's cheaper to get the cams rather than the whole head. if you were talking about the 06+ TSX head, now that would be nice to have.
Actually its got larger diameter valves so i guess its not a simple bolt-on


The 2.4-liter engine is more powerful, delivering 200 PS at 7000 rpm and peak torque of 233 Nm at 4500 rpm – up from 190 PS and 223 Nm. Behind the figures are a compression ratio increased from 10.5 to 11.0:1, larger diameter valves, revised valve timing, and reduced exhaust system pressures.
http://www.vtec.net/news/news-item?news_item_id=740462