Stop being a troll. You made a valid point in your original post about the 550i running out of breath up top, then after that it turned south. The M5 motor on the E60, or the F10 for that matter, is designed with different goals in mind than the 550i. The point others were making is that with progress, the 550 has become as fast as the last generation M5. The Dinan stroker kit increases displacement to 5.8L and hp to 611, so you get 104 hp all for just $33,000. To get to 628 hp you have to spend another $5000 on exhaust and underdrive pulley, for a total of $38K on top of the M5 itself. Comparing that to an F10 550i in stock form or even with a $3500 Dinan chip (501 hp, +101 hp) is ridiculous. Besides, even with the stroker motor you would be slower than a new M5 (which is infinitely more tunable), so why waste your time and money?
Originally Posted by nwilson44
Ohh you meant a stock M5. My bad. The one I'm considering has the dinan stroked 5.7L V10 with 628 horsepower. It's not stock haha my bad for the misunderstanding.
2011 Nissan GTR Red/black - HP Logic tune/midpipe - "Lightning"
2012 BMW X5 50i M-sport Dinan S1 Space gray/black - "Thunder"
2012 BMW 550i M-sport Jet black/black - "Black Cloud"
Gone but not forgotten: '12 X5M, '07 AM SuperVantage, '05 Boxster S, '01 BMW M3,...
Last edited by TahoeM3; 05-14-2012 at 06:47 AM.