Measuring
Air Filter Side
Step One
Locate your air intake opening, by the air filter box
Step Two
Loosen the clamp with a phillips head driver or hand tool
Step Three
Open up the air intake, locate the best side for measurement
Step Four
Measure the (I.D.) Inside Diameter in millimeters
Pro-Tip
Measure the narrow side of the air intake tube, compensating for adjustments
Measuring
Engine Side
Step One
Locate your throttle body opening, by the engine
Step Two
Loosen the clamp, using a phillips head driver or hand tool
Step Three
Open up the throttle body by gently wiggling free
Step Four
Measure the (I.D.) Inside Diameter of the opening in millimeters
Pro-Tip
Check for depth clearance (4-5cm) by the butterfly valve