Hand build 3.5" titanium front mount intake made in house by our highly skilled fabricators. We built this intake system to show as little silicone as possible. Our tubing is made of 3.5" smooth radius mandrel bent titanium. We also back purge all our welds to make an even smoother internal pipe. So that means smooth flow all the way to the engine without any diameter changes. Your M deserves the best, make sure you always install high quality parts.