Reviewed By John G (SHOREWOOD, IL) Reviewed for a 2010 BMW 3-Series —5/29/2016 10:38 AM
This was installed on my BMW 328i X-drive. I notice the boost in HP plus an increased gas mileage by about 1.5. I love the "growl" at 3,000 RPM. A little tricky to put on but ignore the instructions and just use common sense to install.