Shorty Headers for Mercedes W203 C320 C240 – M112

Shorty Headers that Respect Low-End Torque

Old-school header logic still wins: short primaries keep gas speed up. On the M112 V6, that means sharper throttle and real 2–5k rpm pull without killing drivability — the part of the rev range these cars actually live in.

Emissions tier: cat-compatible

This header bolts to the factory catalytic converters and retains OEM-position oxygen sensors. No emissions equipment is removed or bypassed. We do not currently list a CARB Executive Order (EO) number for this part — California-registered vehicles require a CARB EO for aftermarket headers, so confirm your local requirements before ordering. Outside California, check your state’s inspection rules.

M112 V6 — C240 / C320 / CLK320 / E320

Shorty headers match the M112’s low-down torque bias: shorter primaries keep velocity high for quicker response and a stronger mid-range. Expect faster tip-in and a smoother pull to redline.

• Retains factory catalytic converters and downstream exhaust
• Bolt-on replacement for the restrictive cast factory manifolds
• Replaces factory manifolds 112-140-01-09 & 112-140-00-09
• Built for street reliability, not a track-only compromise
• Pairs well with K&N drop-in filters (M112) and a sensible ECU tune

Driving a C32 or SLK32 AMG? Those run the supercharged M112K. We list that application separately, with AMG-specific fitment and install notes — see the C32 / SLK32 AMG M112K shorty headers.

Tech note: short primaries raise exhaust velocity, which helps cylinder scavenging in the low-to-mid band the M112 likes. Results vary by car, tune and supporting mods.