This Boost Leak Tester is made to fit on the INSIDE of your Turbo's intake pipe (TIP) after the MAF sensor housing. Comes standard with a 15 psi gauge, tire valve stem fitting, 3/4" plug and some zip ties. The 3/4" plugs the crankcase breather line that attaches to the TIP. This prevents the compressor pressure from going into the crank case system. Recommended to open the oil cap to prevent any pressure build up in the crankcase.

For stock or aftermarket TIPs that are 3" inner diameter.