The Kids Heart Sileighty includes drift-oriented modifications such as a new ECU, stiffer suspension, an improved limited slip differential, and an increase in turbocharger boost from 7 psi to about 13 psi, resulting in approximately 230 horsepower, versus 205 horse from the standard 180SX SR20DET engine. The Kids Heart model Sileighty can be distinguished from their home-built counterparts by the distinctive “Sileighty” name on the rear dress plate and quarter windows. It is on record that 500 cars were made by this shop, and were only sold in 1998. With the popularity of the 180SX and Silvia conversion, a Japanese auto shop named Kids Heart decided to produce a small number of Nissan Sileighties tuned for drifting. The Sileighty style originated with street racers and drifters in Japan who did the conversion after a wreck because the S13 Silvia’s front panels and lights were lighter and cheaper than the 180SX replacement parts. A Sileighty, also writen Sil80, is a Nissan 180SX with S13 Silvia headlights, front fenders, hood, and front bumper.
In Japan, the engine was upgraded to the 2.0 liter SR20DE engine and optional turbocharged SR20DET in 1991 meanwhile, the North American 240SX kept the KA24DE engine.A popular body modification to the 180SX is the Sileighty conversion. Specs and equipment are similar but the naturally aspirated CA18DE engine was not an option, only the turbocharged CA18DET was available.
In 1993 the S13 Silvia was discontinued, but the 180SX was successful enough to continue production until the end of the S14 Silvia generation. The 180SX is different from the S13 Silvia because it has pop-up headlamps and a hatchback, know as a Fastback in North America.