We take fun seriously so we built the Mini Factory 4.1. This is an all out performance exhaust for play bikes. With the Mini Factory 4.1, you will be the king of backyard motocross and look great doing it! * Superior power on stock and big bore motors * Choose between titanium and stainless steel header * Customize with tuning inserts and spark arrestor * Item ID: 041241 * Type: System * Const: Titanium * Finish: Natural * Midpipe: Stainless Steel * Spark Arrestor: Insert (sold separately) * Quiet Insert: Not Available * Header Const: Stainless Steel * Header Type: Hi-Flo * Weight: 3.4