Dinan's Free Flow Exhaust provides improved flow over the stock system without the excessive noise and ''boominess'' associated with typical after-market mufflers. The system is manufactured using 100% 20 gauge-304 stainless steel for optimum resistance to corrosion. In addition, the muffler is lighter than the stock unit. Internally, the systems feature Dinan's Tuned Resonance Chamber Technology, providing the optimum balance between maximum power gains and a civilized, yet sporty exhaust note. Dual 3-inch diameter polished stainless tips give the cars a tasteful performance look as well. This version of the Dinan exhaust is available for cars produced 3/07 and later, featuring slightly longer exhaust tips to accommodate the updated rear bumper valance.
This exhaust will fit the 535i, 535xi, 535it, 535xit and 550i.