Mod-Files.com is the best tuning server on the web for Johnson J40 Outboard tuning files. All Johnson tuning files are custom made and thoroughly tested on a 4x4 dynometer. The development of each Johnson tuning file is the result of perfection and dedication by our programmers. Many tuners in the world are working on mod-files.com because they are trusting our result.

Hochwertige Tuning Fil Johnson J40 Outboard 815cc Four stroke EFI 39hp

• Custom file guarantee.
• All files are developed under 4x4 dynamometer.
• Possibly of minimize fuel consumption.