Due to Larger Diameter.You Must Use A Pro Series Intake Manifold or Make Adjustments to Intake Manifold Throttle Body Flange to Match Bore and Keep IAC (Idle Air Control) Passage Separate.

Complement your Series Throttle Body with a Pro Series Intake Manifold for increased airflow.

Will not fit on some D-series manifold with IAC opening less than 70mm. Must use Pro Series Intake Manifold or similar.

Series Throttle Bodies are precision die-cast from high-quality materials and include features previously offered only in our Pro Series line, like countersunk, stainless steel mounting bolts, solid brass throttle plates, fully machined bores, and idle adjustment screws for fine tuning.

All throttle bodies undergo an extensive design and testing process to produce a throttle body that doesn't just provide more flow but retains smooth drivability and OEM throttle characteristics.

A larger throttle body is key to producing additional power throughout the powerband on modified engines with increased airflow demands.

Series Throttle Bodies for B-series engines feature a large, 70mm bore, which results in significant horsepower gains throughout the powerband on heavily modified, naturally aspirated applications and even more on forced induction ones.