Boost Leak Tester - 2.50" - BOOSTLEAK-2.50 Audi RS3 1/4in Barbed Fittings - Matches

1/4in Barbed Fittings - Matches the factory turbo and wastegate hose size

In need of replacement coolant lines for your GrimmSpeed JB400 or BB500 Turbocharger

The upgraded gear selector springs aren't required but are recommended to further improve the feel of your gear changes

2°F (14°C) earlier than the stock thermostat at 154

10-micron microglass replaceable element

Boost Leak Tester - 2.50" - BOOSTLEAK-2.50 Audi RS3 1/4in Barbed Fittings - MatchesBoost Leak Tester is a must have for your boosted setup. Install the Boost Leak Tester to your turbo inlet and apply compressed air through the tire valve stem. You can listen for air leaks or spray soapy water in suspect areas. Boost Leak Tester uses a 2. 5" tester cap and a silicone hose reducer to fit your turbo inlet size. You can use different size reducer hoses to fit other size inlets.