Consisting of two modifications:
Engine: According to Catalogue TRD (Toyota Racing Development) there are 4 groups (Stage 1-4) namely:
Stage-1: Modifications that produces 25% of the Supplement to Labor Standards. The aim is to enhance the capability and reliability of the machine.
Stage-2: Modifications to generate power 40% of Standards. Usually to rally and circuit racers amateur class
Stage-3: Modifications to generate additional power 70-100%. Used for the racer / professional rider.
Stage-4: Modification of power 100% and is usually used for the Sprint Distance Short and Straight with Supersonic Speed.
Chassis: These modifications are usually concentrated on the transmission and suspension systems.
Transmission, replacement of the extremes are of standard type to the type Close ratio (the ratio of each gear close to each other). Usually used for rally, where the gearshift is required without reducing engine power.
Suspension, this modification there are two streams of Tall and flat, For Making your vehicle look Tall height angle between the axle position as coupling and not too steep, then most likely as a joint cross coupling can quickly wear out or break when you use in bad terrain. To create a flat sedan / minivan with reduced screw per slug or a leaf in the pres flat or sometimes the curve becomes negative. These tweaks should not be imitated, because the number of conch Per reduced ulirnya will lose flexibility in reducing shocks. So is a leaf will be reduced elasticity and becomes hard suspension kickback effect.