Headers are one of the easiest bolt-on accessories you can use to improve your Celica's performance. The goal of headers is to make it easier for the engine to push exhaust gases out of the cylinders.

2003 Toyota Celica GTS

The 2003 Celica receives minor cosmetic updates from the 2002 model. The exterior revisions include a new front bumper with a wider upper intake nestled in the front fascia, newly-available high intensity discharge headlights, and redesigned rear lights. The interior also is redesigned for the center dash cluster, a reshaped LCD combination meter, and chrome trimmings. The premium sound system, optional on the GT model, is upgraded to a JBL premium 3-in-1 sounds system, which includes a power antenna. Also new for 2003 are exterior colors Solar Yellow and Zephyr Blue Metallic. Under the hood, the 1.8L DOHC 16-valve 4-cylinder 140-hp (GT model) and 180-hp (GTS model) engines remain unchanged, along with the transmission and suspension.

2004 Toyota Celica GTS

For 2004 the Celica is available in two trims - GT and GTS. Both are available with the Action Package (aggressively styled front and rear bumpers, rocker panels, and rear spoiler) and either a manual or automatic. The GT model features air conditioning, tilt steering, disc/drum brakes and 140 hp engine. The sportier GTS model upgrades the GT with a 180 hp engine and six-speed manual transmission, 16? alloy wheels, four-wheel disc brakes, power windows/locks, and cruise control. Options on both trims include high intensity discharge headlamps, power tilt/slide moonroof, and side impact air bags. Leather seating is available exclusively on the GTS. Accessories available on the Celica include OBX Racing Sports pedals and shifter.

The idea behind an exhaust header is to eliminate the manifold's back pressure. Instead of a common manifold that all of the cylinders share, each cylinder gets its own exhaust pipe headers. These pipes come together in a larger pipe called the collector. The individual pipes are cut and bent so that each one is the same length as the others. By making them the same length, it guarantees that each cylinder's exhaust gases arrive in the collector spaced out equally so there is no back pressure generated by the cylinders sharing the collector.