he biggest restriction to making high power with the M156 engine is
the limited flow of the factory exhaust manifolds. Whether you want to
make as much power as possible naturally aspirated, or are looking to
run one of our M156 Stage 2 or a Stage 3 Supercharger Systems, it will
be necessary to upgrade to long tube headers.
To make for the best power possible, the headers feature 2” primaries
that allow for as much flow out of the cylinder head as possible. The
large primaries and proper O2 sensor placement of these headers work
extremely well when coupled with our Stage 2 and Stage 3 supercharger
systems resulting in the best performance and drivability out of all the
headers that are currently on the market.
*Actual system may be different than picture depending on chassis.
Packaged with the headers are 3” Stainless Steel Midpipes, and a 3”
Stainless Steel X Pipe resulting in a bolt on installation that retains
the factory resonator and mufflers.
When paired with Weistec ECU Upgrade and Weistec High Flow Air
Filters, power gains are typically 90+hp at the wheels for naturally
aspirated vehicles. These headers are required for Stage 2, and Stage 3
Supercharger Systems to achieve advertised power.
All Stainless Construction
Midpipes and X Pipe
Proper O2 Sensor Placement
Exhaust Manifold Gaskets Included
Bolt In, no Cutting