Spec-D Tuning HH1-CV99SI-DK Honda Civic Si Jdm Performance Header Exhuast 1 Set of Stainless Steel Exhaust Header Hi-performance C.N.C. chrome finished header Approximately increase up to 10-15 hp 30 Day Money Back Guarantee & 90 Days Limited Warranty Made by OEM approved & ISO certified manufacturers in materials that meet or exceed strict OEM requirements