K-Tuned 409 Series Race Header - 02-05 Civic Si / 02-06 RSX

K-Tuned RSX 409 Series Race Header
K-Tuned's 409 Series RSX Race Header is assembled with mandrel bent, 409 series steel tubing and is fully tig welded. They have used a slightly thicker gauge tubing that allows for better weld penetration and additional strength. The CNC cut 3/8" thick flanges are also double welded and then ported for optimum flow at entry and exit. This header directly replaces the OEM 2-piece design and eliminates the catalytic converter so they've included a short 2.5" test-pipe with defouler for the secondary O2 sensor. This header features stepped piping beginning with 44mm primaries that progressively move into 48mm, then 50mm secondaries and finally a 64mm or 2.5” exit.

The K-Tuned RSX Header utilizes a proven 4-2-1 Tri-Y design with extremely smooth slip fit merge transitions to increase the exhaust flow and power output of the Honda K engine. Like most Tri-Y designs, power gains are seen almost everywhere in the power band, not just the top end. Fitment is equally if not more important to K-Tuned than function and although the subrame and swaybar on the RSX presented some design challenges, the final fitment was definitely worth some extra time. The secondary tubing passes perfectly through this tight area with extra clearance for engine movement.

This head compliments K-Tuned's 3" Oval Tube Exhaust System for the RSX if you haven't seen it already.

Key Features:

  • Fits RSX chassis (base and Type-S)  with K20 engine ONLY (not K24); Also fits 02-05 Civic Si with RSX Type-S exhaust system
  • Full 409 steel construction
  • 409 series steel
  • 100% Tig welded
  • CNC cut 38/" flanges
  • 2.5" Outlet Flange
  • 4-2-1 Tri-Y design

This is a Race Only product that is to be used solely for competition. It cannot be used on vehicles that are operated on public streets, roads or highways. Its use is limited to closed-course and open-course racing that is formally sanctioned by a recognized racing organization. Any other use, including recreational off-road use, could be in violation of local, state and federal laws.

K-Tuned 409 Series Race Header - 02-05 Civic Si / 02-06 RSX

Regular price Sale $449.99
Ships: Pre-order
This is an estimated ship date once your order is placed from JHPUSA. Ship dates do not include weekends and holidays.
California Residents Warning:
Cancer & Reproductive Harm
Welcome Newcomer