M278 Biturbo Downpipes

Forget minor upgrades—our downpipes give you a solid 25 wheel horsepower boost right off the bat. But the real magic happens when you pair them with a tune, pushing your M278 to AMG M157 territory.

Let your turbos do their job. MBH downpipes remove that restrictive backpressure, letting them spool up faster. The result? Sharper throttle response and better power delivery every time you hit the pedal.

Our downpipes are pure American-made performance. Crafted from 16-gauge 304 stainless steel RathGibson tubing, MBH downpipes outclass all the knock-off imports. Go ahead, compare them. We back ours with a lifetime warranty because we know they’re the best in the game.

Installing our downpipes is straight-up simple. No engine dropping, no motor mount removal—just an hour  (or less) with a lift, and you’re set. The slip-fit joints give you the flexibility to lock everything into place perfectly, making the whole process smoother than you’d expect.