Constructed of T-304 Stainless Steel, Mandrel-Bent tubing and Laser-Cut Flanges; Each set is tested and dynoed to make ensure the fitment and performance meet our Standards. All Megan Racing products come with a One-Year Manufacturers-Defect Warranty. Application: 1999-2000 Civic Si (B16A) - Constructed of T-304 Stainless Steel for Durability - Polished finish offers a show-car quality look. - Equal Length 4-1 Primaries for High-End Power to enhance VTEC. - Larger 2.25" Colllector for better flow and retain OEM fitment.