See i'm now confused as if two are on inboard side above and below the wing or both are on out board side?, i always thought that there were four exhaust outlets, 2 on each side of the engine but my friend ottopeter from Germany sais i was wrong as there only 3 exhaust ports on these engines.
Yeah your second suggestion could be considered, i could leave it up to builder to decide what he want to do with these or leave one as blank if he desires to.