M278 Mercedes Intake Spacer Kit + Set of K&N Drop-in Performance Air Filters (4.7L V8 Bi-Turbo)

The ultimate OEM+ intake upgrade — K&N high-flow filters + precision airbox spacers for maximum throttle sharpness and mid-range power. Why This K&N + Spacer Combo Crushes It on the M278 ✅ Airbox Spacers (Left + Right) Raises the filter sealing plane for smoother, higher-volume airflow into the MAF housing. ✅ K&N 33-2474 Performance Filters Legendary oiled cotton media + Million Mile Warranty® — proven HP gains, washable, CARB legal, no tuning needed. ✅ Factory Airbox Retained Keeps perfect cold-air routing & heat shields — zero heat-soak, zero MAF issues. Real-World Results Owners Report Crispier throttle tip-in and noticeably stronger mid-range pull Better power consistency on hot days and repeated pulls Perfect headroom for headers, downpipes, tune, or E85 Zero check-engine lights • Fully reversible • No ECU retune “K&N filters + spacers on my E550 with downpipes = night and day difference. Throttle is razor sharp and it pulls way harder now.” – Alex R., 2015 CLS550 • 512 whp What You Get (Full Combo Kit) ✔ 2 × Precision CNC-machined airbox spacers (left + right) ✔ 2 × K&N 33-2474 High-Flow Performance Air Filters (pre-oiled) Fits These M278 4.7L BiTurbo V8 Models Model Chassis Years E 550 • CLS 550 W212 / C218 2012–2016 S 550 / S 560 • CL 550 W221 • W222 • C216 • C217 • A217 2011–2017 SL 550 R231 2013–2020 GL / GLS 450 • 550 • ML / GLE 550 X166 • W166 2012–2019 ✅ Always verify M278 engine code • Message me if unsure Install in ~20 minutes • No tools beyond a 10mm socket • Fully reversible 🔥 Add Combo Kit to Cart – Ships Same Day BenzUnited Parts • Mercedes Performance Specialist • Burbank, CA