The 2003 season saw Zacchia team up with ex-Formula One driver Philippe Alliot and French singer David Hallyday for Force One Racing Festina.

After racing in Le Mans Series in 2004, he returned to FIA GT in 2005 with Larbre Compétition He teamed up with Swiss compatriots Lilian Bryner and Enzo Calderari He earned 16 points during the season.

2007 saw Zacchia race in the French GT Championship for Solution F earning 18 points with co-driver Jean-Yves Adam.

He raced for Larbre Compétition in the GTS class using a Chrysler Viper GTS-R. His team mates were Patrice Goueslard and 1993 24 Hours of Le Mans winner Christophe Bouchut.

Zacchia focused on FIA GT for the next two seasons before returning to LMS in 2007, once again with Larbe with support from Aston Martin Racing as Larbre ran their DBR9.

For the final round, the 2007 Mil Milhas Brasil, the duo were joined by Roland Bervillé and Brazilian racer Fernando Rees.

Zacchia raced a Lola B08/80-Judd in the LMP2 class along with team mates Andrea Belicchi and Xavier Pompidou The trio picked up points in only the first event of the season, the 1000 km of Catalunya where they finished second in class Zacchia and co. finished tenth in the drivers championship and seventh in the teams.

He competed a full season in the one-make Formula Le Mans (FLM) class along with Luca Moro and Wolfgang Kaufmann.

It will be powered by a two-litre four cylinder petrol engine from Volkswagen modified by Lehmann Motoren, badged as Swiss HyTech.

It also features KERS, an automotive system whereby the kinetic energy of a moving vehicle is recovered under braking and stored in the flywheel for later use under acceleration, developed by Flybrid.