A friend was planning to purchase one these at Toledo, the display engine had the same same problem, tight at BDC. I talked my friend into waiting before taking the jump. My reasoning to him was if they can't take the time to make the Toledo display engine good, what makes you believe any of production models are better? The asian man behind the table said it was tight because of compression, I showed him the exhaust port, laughed and walked away. Another person at our club bought one at Toledo, he wanted the S version, they gave him the S heads and asked that he send the straight heads back to TBM once he makes the change. Wonder if his warranty is intact? I hope it works out for him, I rather take my $420 to the Rivers Casino in Pittsburgh, I can loose it there just as quick.