Not to throw gasoline on the fire here but.... I too talked with my trusted independent shop, they did all the work on my 964 and it was badazz. He pretty much said point blank to avoid the m96/m97 engines. He's getting one a month

for upgrade/rebuild/engine swap out. You don't have to hit me over the head twice. Currently looking at RS4's to get my euro fix....fixed
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1991 964 C2 -SOLD - miss it everyday -

2009 Honda CRV
2007 Audi A4 Quattro - just a sweet personal car -
2000 Land Rover Disco II - lifted
2001 GMC Seirra 1500HD CREWCAB