The S15 line was later expanded to include various luxury and upgrade option packages for both the Spec-S and Spec-R. Autech, a specialty car developer, also offered several tuned versions of the S15; one with body and interior trim modeled after the Ferrari 456, called the style-A, available in both Spec-S and Spec-R based trims; and a second tuned version was based on the Spec-S trim level with the engine output increased to 200 horsepower through the use of increased compression, more aggressive camshafts, and free-breathing intake and exhaust tracts, along with ECU tuning and upgrades to the chassis and suspension.