Filter
Top Products
Pro-Flo Header
1999-2000 Honda Civic Si
Catalog PNs 6643, 6743, 4743
Please study these instructions carefully before installing your new Pro-Flo Header.
They provide general guidelines to be studied and understood before you remove your stock
system. Failure to follow these instructions may void your warranty. If you have any questions or
problems, please contact our Technical Hotline at : 1-800-416-8628 from 7 am – 5 pm,
Monday through Friday, Pacific Standard Time.
DESCRIPTION: Edelbrock Pro-Flo header components are designed to improve the exhaust
efficiency of the Honda Civic 1.8L engine. A performance gain can be expected with the
installation of the system. This system requires no welding for installation and retains all stock
emissions equipment.
Suggested tools needed for installation: This vehicle has some metric fasteners.
• 3/8” ratchet socket set with extensions and a good assortment of metric sockets
• Combination wrenches (metric)
• Universal 12mm and 14mm swivel sockets
• Jackstands, screwdrivers, pliers, crescent wrench, etc.
• Liquid penetrant (GM #1052627 or equivalent); anti-seize compound (GM #5613695 or
equivalent)
SPECIAL NOTICE: This Edelbrock part has received an Executive Order number (E.O. #) from
the California Air Resources Board (C.A.R.B.) making it legal for street use on pollution-controlled
motor vehicles in all 50 states. To assist you with emissions equipment certification, we have
included a silver fan shroud decal to help testing personnel verify that this part is a legal
replacement part on the vehicle for which it is cataloged. The adhesive-backed decal should be
affixed to your fan shroud next to the existing emission and engine specification decal. Do not
cover your original equipment specification decal with the Edelbrock fan shroud decal.
WARNING: The use of “Thermal Wrap” or any aftermarket coating process will void the
warranty on your Pro-Flo header. Those products can cause excessive heat and moisture build up
resulting in corrosion and early failure of the system.
DISASSEMBLY:
1. Disconnect battery negative cable from battery.
2. Raise vehicle and support with jackstand.
3. The use of penetrating oil when removing and the use of anti-seize compound when
installing nuts and bolts will prevent the possibility of broken or stripped nuts and bolts.
4. Make sure converter is cool.