I recently purchased a CTSC, with a part or 2 missing. Found the rest, but I'm curious as to which ESM I need as there is 2 listed!

One is 2.8v (340-050) and one is 2.9v (340-055).
http://www.autocarparts.com/c_Honda_S2000_m_Comptech/


Is there a difference other than the voltage?
And why is there a difference?
Which one should be purchased since they are both the same cost?

Any help would be appreciated.

 

I think it would effect the map sensor signal that reaches the ecu. Not sure of the correct spec but its adjustable anyway.

 

I'm pretty sure it's 2.9

 

mines is at 2.94v

 

So the general consensis is 2.9v?