Tuning file GMC Sierra (1999 - 2007) 6.6 Duramax 365hp

Royz Tunz is leading in the development of GMC Sierra (1999 - 2007) 6.6 Duramax 365hp remapping / chiptuning files. The development of each GMC Sierra 6.6 Duramax 365hp tuning file is the result of perfection and dedication by Royz Tunz programmers. The organization only uses the latest technologies and has many years experience in ECU remapping software. Many leading ChipTuning / Remapping Companies and Tune Installers around Australia & New Zealand download their tuning files for GMC Sierra (1999 - 2007) 6.6 Duramax 365hp at Royz Tunz for the best possible result. All GMC Sierra (1999 - 2007) 6.6 Duramax 365hp tuning files deliver the best possible performance and results within the safety margins.

• 100% custom made tuning file guarantee
• Tested and developed via a 4x4 Dynometer here in Melbourne
• Best possible performance and results, within the safety margins
• Reduced fuel consumption
• Used by Leading Tuners across Sydney, Melbourne, Alice Springs, Perth, Adelaide, Geelong, New Castle, Brisbane, Gold Coast, Darwin and Hobart
• Compatible with files read by Kess V2, New Gunius and other Master and Slave tools