Air Filter Calculator
Calculate air filter CFM requirements, sizing, and replacement intervals for your engine.
Engine Specifications
Stock: 80-85%, Performance: 90-95%, Forced induction: 100%+
Filter Dimensions (inches)
Usage & Conditions
Filter May Be Undersized
180 CFM
Required airflow at 6000 RPM
Filter Sizing Analysis
Your Filter Area96.0 sq in
Recommended Area315.2 sq in
Capacity Rating30%
Replacement Schedule
Every 15,000 miles
~0.8 replacements per year
Annual Cost Comparison
Paper Filters$12/year
Performance Filters$40/year
Reusable (K&N style)$17/year
Performance Impact
New Filter Restriction0.5" H2O
Dirty Filter Restriction2.5" H2O
Est. HP Loss (dirty)~8.0 HP