Order processing time has increased due to simultaneous tax & stimulus refunds. Please email us ahead of time if you are on a specific timeline. Turbos and plenums are made to order and will have additional lead time. As always, we appreciate your support of our small business and look forward to working with you!

Turbomaster Wastegate Controllers

Quadstar Tuning LLC

  • $119.00

Delete your vacuum pump and gain the reliability you need for your 6.5L with genuine Turbo Masters!. Also known as a mechanical boost or wastegate controller.

Typical variants include include the following but please ask if you are unsure because turbos are typically swapped from the OEM configuration:

 1991-1995 6.5L Truck : GM3 or GM4 Turbo

1996-2000 6.5L Truck : GM5 or GM8 Turbo

1994+ H1 Hummer or Van : GM6 or GM7 Turbo

Tuning is required to gain full benefits and prevent trouble codes with de-fueling. Contact us for options!

A boost gauge is required with this product so you can set/monitor you boost levels.  Order the boost bolt separately as a bolt-on way to add a boost gauge to stock intake plenums.

When removing the vacuum pump completely, you will need to use a shorter serpentine belt. General information is as follows:

  • 1994-1995: 101" - 101.5" Belt
  • 1996+: 99.5" or 100" Belt
  • Generally speaking they are ~1" shorter then the stock belt


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