I know this IS a stupid question but what engine code is the 05 Si engine....
Also im trying to reflash my Ecu, does anyone have any ideas on where is can get that done.

 

K20A3....the "2 stage LS" motor in my opinion.....but well suited....anyhow, reflash for what?...after mods on ep3's, just remove the ECU fuse and drive the car around and reset the readiness moniters....unless you have K100 hondata....a reflash doesn't do ****

 

well i have dc race headers 2 3/4 cat back aem cold air intake no cat i just wanted to get my ecu reflashed as in something that will give me more hp ???

 

you CAN....but you would be better to save up, and up, and up, and up.....do the type s head swap, and hondata k-pro all at once....you get k100...and thats it...u do another mod.....you gotta flash again....if you just leave it....get your type s head, do the swap...at the same time u get hondata....you won't have issues with the key immobilizer, and you can immidiatly have it tuned...then later on u add boost, nitrous, cams, anything....and everything you can simply have it re-tuned in a matter of hours as opposed to weeks your car sits in a garage waiting for the ecu to be sent back and fourth

 

to answer your question...
it is the k20a3