Quadstar Tuning will be CLOSED from July 10th to July 26th, 2020. Any emails, messages or orders placed during this time will be answered and processed beginning July 27th. During this time, we will be restructuring to serve you better and some product listings may change. We'll be coming back strong with multiple new product releases. As always, thank you for your support!!!


Holset Turbo Downpipe Adapters

PT Wiring Solutions

  • $150.00


Bolt-on adapters for wastegated Holset exhaust housings.  These are designed to connect these popular turbo swaps to your factory or aftermarket downpipe in a matter of minutes.

Now featuring CNC sealing rings for the downpipe connection.

This is for the "Do it Yourself " DIY customer who needs the adapter as part of their turbo swap project.

 Please choose the correct type based on the turbo you are using. PLEASE DOUBLE CHECK BEFORE ORDERING.

  • HX35W, HX40WII, WH1C
    • These typically have a 3" v-band flange on the exhaust plate that will be replaced by this adapter
  • HX40W
    • These typically have a 4" v-band flange on the exhaust plate that will be replaced by this adapter

*Be sure to check out our other listings for full install kits or other individual components you may need


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