Vehicle-specific boost leak testers for Duramax.
Check the engine and year in the product name, or text us a photo of your setup and we'll point you to the right kit.
Losing boost on a Duramax 6.6L? Pick the kit by engine and by how you like to work. LB7 through LML trucks can use the 30 PSI Basic Kit, or step up to a 60 PSI Pro-Kit with a 5 ft extension line, with either a shut-off or a regulator. L5P trucks from 2017 on have a separate 30 PSI tester. All of them are billet aluminum.
| Kit | Fits | Gauge | Fill / extension | Best for |
|---|---|---|---|---|
| Basic Kit | LB7, LLY, LBZ, LMM, LML | 30 PSI | Tire valve (fill with a tire inflator) | DIY owners, occasional testing |
| Kit with 5 ft extension | LB7, LLY, LBZ, LMM, LML | 60 PSI | 5 ft line with shut-off valve and shop air fitting | Testing with shop air from outside the engine bay |
| Shop Kit (regulated) | LB7, LLY, LBZ, LMM, LML | 60 PSI | 5 ft line with regulator and shut-off valve | Shops: set an exact test pressure every time |
| L5P Kit | L5P (2017+) only | 30 PSI | See listing | 2017+ trucks; the other kits do not fit the L5P |
