I'm looking for an experienced shop in doing emissions work on BMWs, especially V8's. My current 94' 530i (160K) keeps failing on emissions even though I've replaced many parts and I have kept up with maintenance.

I am fully aware of the Nikasil problem and my engine doesn't seem to have this issue, I've had it compression and leak tested.

Cats have been replaced, complete intake reseal, all tune up items done always, not sure on smog pump status, and I've reset the adaptation values, all to only improve but not pass emissions testing. Idles well (for a V8 of its generation), and doesn't smell out the pipe, or blow smoke, and MPG is/are ok, zero engine hesitation and very fast.

One thing is that when my car is tested for some reason the engine status comes up as a 6 cylinder on the state inspection page. And also the emission results are very similar to what it was producing in year 2000 (i have paperwork) and by the standards of 2000 it still passes, but in 2008 some of the limits have been cut to 1/3 of 2000.

Personally I think the limits have become too stringent and the car is just fine. Any help or recommendation on a shop would be great, especially a MA Emissions certified place (so I can get the waiver after $200 of service). Thank you to anyone,

Patrick