This throttle body is a true race piece, not a re-warmed,
over-bored stock unit
Headers make big changes in power output, but after that, the
throttle body is the biggest restriction in your car's engine - a
glorified air pump. Add cams and your throttle body is
choking the flow. Once you free up the other restrictions,
the 64mm stock throttle body just doesn't cut it. These units
are new pieces, not rebored stock parts.
Available in two diameters to meet your engines performance
needs:
70mm - The 70mm version
of our throttle body is excellent for stock cam M3 engines and
modified 2.8L and M3 engines in most applications.
Installation requires modification of
the factory intake plenum to enlarge the intake opening and
a modified BimmerWorld Silicone Intake Boot (not included)
75mm - This component is designed for use
with high RPM engines that are moving big air - you must have cams
and a full race exhaust including large primary headers to see the
full benefit. Gains can be in the 10-15Hp range for a 3.2L
race engine with our Sunbelt Stage 3 cams with all other
accessories maximized, but if your engine is not flowing as much air,
gains will be reduced. Installation requires modification of
the factory intake plenum to enlarge the intake opening and
a modified BimmerWorld Silicone Intake Boot or 3.5" silicone elbow (not
included)
Fits M50/52 engines (1992-1999, 325-M3) with OBD-1
electronics.
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