This is for the US spec ECOTEC found on 09 thru11 aveos the Euro engine code is Opel's Z16xer/Z18xer. If you have the 08-aveo I beleive the engine is the Z16xe or xep. What I did was e mail John Ashley thru his sites "contact us" I sent pictures of my exhaust gasket with a tape measure beneath for reference and it was close enough to pull the trigger. The head studs n ports matched perfect but the bottom of header flange I modified. The car ran like s*it till I pulled the negative terminal off of the battery and did the idle air control valve reset that I found on here. For the last 2 days Im all good wnjoying my daily commute. This is the best mod on these motors the entire exhaust is restrictive. Im not trying to start a great debate but it nearly seems like a stock b13 se-r( almost ). Now to try to work off the CEL- Ive got emissions every 2 years in IL

http://www.jaex.co.uk/