The factory never intended to race the F40, but the car saw competition as early as 1989 when it debuted in the Laguna Seca Raceway round of the IMSA, appearing in the GTO category, with a LM evolution model driven by Jean Alesi, finishing third to the two faster spaceframed four wheel drive Audi 90 and beating a host of other factory backed spaceframe specials that dominated the races. Despite lack of factory backing, the car would soon have another successful season there under a host of guest drivers such as Jean-Pierre Jabouille, Jacques Laffite and Hurley Haywood taking a total of three second places and one third.
Although the F40 would not return to IMSA for the following season, it would later be a popular choice by privateers to compete in numerous domestic GT series including JGTC. In 1994, the car made its debut in international competitions, with one car campaigned in the BPR Global GT Series by Strandell, winning at the 4 Hours of Vallelunga.
In 1995, the number of F40s climbed to four, developed independently by Pilot-Aldix Racing (F40 LM) and Strandell (F40 GTE, racing under the Ferrari Club Italia banner), winning the 4 Hours of Anderstorp. No longer competitive against the McLaren F1 GTR, the Ferrari F40 returned for another year in 1996, managing to repeat the previous year's Anderstorp win, and from then on it was no longer seen in GT racing.
Source: Wikipedia (original)