710 Emissions I going back down to the diesel shop, but my BN Machinist freinds that run the Opacity tests. Tell me that our BN-SF SD 70MAC's with the 710, DO NOT meet emsissions. Some are close, most are not. Mainly due to lack of maintance. I watch our MAC's run everyday when they go by me with exhaust blowing as black as a steam engine, you can't tell me they meet ANY emssions standards. And for the most part about 80% of them do it. I will go check it out AGAIN and get back to you.