H21101 99-00 Civic Si (DOHC) 4-1 Header H21101 94-97 Civic DELSOL (DOHC) 4-1 Header

T-304 #1 grade stainless steel tubing, polished to a bright luster. 1 5/8” x 2” mandrel bent tubing X .065 wall thickness. Flange is 3/8” thick stainless steel. All headers are TIG welded construction. Strup H21101 4-1 header fits the B16 motors Provides 10-12 horsepower gains. All Strup Headers re-use the OEM stock manifold metal gaskets.