Just a quick look on Wiki and I take it you have this model....
The GT-S was powered by the 2ZZ-GE engine rated at 180 bhp (134 kW; 182 PS) at 7600 rpm and 133 lb·ft (180 N·m) torque at 6800 rpm. The engine featured Toyota’s VVTL-i (Variable Valve Timing and Lift control with intelligence). A second stage valve lift control for intake was added to the variable intake cam phase timing. Variants of this engine were offered in the Matrix XRS, Corolla XRS and the
Lotus Elise (with a Lotus ECU which added 10 bhp). Buyers had the option of a 4-speed automatic or 6-speed manual transmissions. The base tire size was 205/55/15 but the optional size offered was 205/50/16. The tire upgrade was merelyUS$42 so most GT-S models had the optional wheels and tires. All GT-S models had 4-wheel disc brakes and metal pedals. Manual transmission shifters and all steering wheels were upgraded to leather. Liftback cargo covers were standard along with fog lights for models without the "Action Package".
TRD USA offered performance upgrades such as lowering springs, dampers, anti-sway bars, brake disc pads, air filters, exhaust, short-shift kits (manual transmissions), and body kits. The exhaust offered an increase of 14 hp (10 kW), albeit mostly at higher rpm’s. A supercharger was also offered for the 1ZZ-FE engine however Toyota never marketed it directly for the Celica GT due to being too large to fit under the hood, The supercharger was available as an option for 2003–2004 Corolla and Matrix models. The most popular among buyers were the “Action Package” which offered a more pronounced front spoiler, rocker panels, a rear wing, and lower rear fascia extension. The revised front faring interfered with the mounting location for the standard factory fog lights, requiring them to be adjusted or removed when this option was added.
On the 2000, 2001, 2003 and 2004 GT-S models, the rev limiter is set to around 8200–8300 rpm (seems to differ vehicle-to-vehicle) while the 2002 and 2005 have it set to 7800 (left-hand drive markets only). This lower limiter on the 2002 and 2005 models reduces the available performance as the 2ZZ is primarily a high-revving engine, and it is more difficult for the driver to land in the 'lift' (aggressive cam) rev range on an upshift. This only affects the 6-speed manual transmission as the gearing is spaced to where shifting up at approximately 8,250 rpms in any gear other than first gear will result in about 6,200 rpm after the shift, which is where "lift", or the aggressive cam, engages. This allows models without the limited rpm range to remain within the car's power band throughout the gears. First gear is excluded because the gearing ratio is much lower than 2nd gear.
