FacSpec Guides
What to do first, what to skip, and what each job actually takes.
BMW G8X M3/M4 Intake Buying Guide: AWE vs Eventuri vs aFe
A practical comparison of popular BMW G8X M3/M4 intake approaches from AWE, Eventuri, and aFe, including fitment, airflow design, published performance claims,...
BMW G8X M3/M4 Wheel Spacer Fitment Guide
A straightforward guide to BMW G8X M3/M4 wheel spacer sizing, including 12mm and 15mm setups, tire-clearance considerations, required hardware, and FacSpec's recommended...
Mercedes-Benz AMG W205 C63 Exhaust Guide
A practical guide to choosing an exhaust for the Mercedes-Benz AMG W205-generation C63 and C63 S, including model-year differences, factory valve compatibility,...
Porsche 992 911 Exhaust Buying Guide
A practical guide to choosing an exhaust for the Porsche 992-generation 911 Carrera, including 992.1 vs. 992.2 fitment, PSE compatibility, valved vs....
Audi 8Y RS3 Intake Guide
A practical guide to choosing an intake for the Audi 8Y and 8Y.2 RS3, including turbo-inlet compatibility, PCV differences, stock vs. hybrid...