Overview Product Description INCLUDES 2 SPRINGS. APPROVED BY BRIGGS & STRATTON TO BE USED WITH WORLD FORMULA PIPE P/N EXF5950. Product Videos Custom Field Product Reviews Write a Review Write a Review × P/N EXF4108: World Formula Silencer, USA Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *