how do u tell the difference between 04-05 and 06-08 rbb intake manifold. trying to purchase one and mines say hf1 and to one im looking at say hf2.. some help would b nice

 

Im not sure but i think the throttle body on the +06 is bigger allowing more airflow.

 

the easiest way to determine is the 04-05 has an iacv provision whereas the 06-08 doesnt (dbw). the other has been mentioned already..... 61.8xmm tb opening for the 04-05, 65.xxmm opening on the 06-08. this link has a pic of an untouched the 04-05 tb opening http://www.hondata.com/tuning_k24a2_tsx_engine.html