Upgraded GPX 4500 up against the Minelab GPZ 7000

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Big Ballarat gold nugget found with a modified GPX 4500

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The world's most advanced
Minelab detector upgrades

We provide modifications to all Minelab SD, GP and GPX pulse-induction metal detectors. Proven by professional prospectors to be the most technically advanced Upgrades and Modifications available, we guarantee to make your detector detect deeper targets while improving sensitivity and quietness on even the most mineralised ground. A five-year workmanship warranty covers all detector upgrades.

Read about the new 2020 upgrades

Introducing the most effective EMI filter for pulse-induction detectors.

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2020 Upgrades & Modifications

GPX Series

  • GPX 4000
  • GPX 4500
  • GPX 4800
  • GPX 5000

Our 5th Gen Front-End variable gain control allows for optimal signal to noise management, greatly improving sensitivity and depth capabilities.

The Updated Frequency control allows for two hundred and fifty-five positions, providing a 25% swing to pulse width. Perfect for optimising your detector for any aftermarket coil.

Tests have shown that these new upgrades beat the SDC detectors on small gold at depth and will easily compete with the new GPZ-series detector on both small and large gold.

GP Series

  • GP extreme
  • GP 3000
  • GP 3500

Our 5th Gen Front-End variable gain control allows for optimal signal to noise management, significantly improving sensitivity and depth capabilities.

Now with a fully variable frequency control—similar to the GPX series—you can optimise for a much wider range of target sizes.

The Latest GP series upgrades will have your machine handling any ground type with ease. (Optional Sensitive-Boost switch for advanced users)

SD 2000

A low-frequency super-deep modification allows you to use the largest coils for the most depth possible, with the ability to switch back to regular operation. (This is only available for the SD 2000)

Gain control will tune your detectors signal amplification to best suit your situation. Small Gold modifications are possible for the SD 2000 upon request, as are audio manipulations for advanced users.

SD 2100 Series

  • SD 2100
  • SD 2100e
  • SD2100v2

We add three timing positions allowing these detectors to be optimised for various sized targets and coils. Added audio frequency boosting gives a sharper response to the detection of gold. A switch is added to allow 3 or 4 pulses, which can improve the detector's ability to deal with tricky ground. Variable gain adds another layer of control to the machine's capabilities in the field.

SD 2200 Series

  • SD 2200d
  • SD2200v2

We add three timing positions to allow the detector to optimise for various sized gold and a range of coils. A switch gives you three ground mineral timings to best suit the ground you are detecting on, and our new Variable Front End Gain allows you to tune your machine to have the best performance possible regardless of conditions.

Shipping your detector

To ensure your detector's safety, we've written a general guideline for packaging and sending your control box. We follow these guidelines while repackaging your detector.


We only need your control box to perform the upgrades ( if you have trouble removing quick track handles, feel free to post it, if easier.)To assure it will be safe while in the post. Be sure to use some packaging material around the plastic end-caps. We find using scrunched newspaper sheets around the detector to work best.

Make sure you've completed an order form. If you're unable to print, write clearly your contact details, services you would like performed to your detector, and any other information necessary.

We suggest packing your control box in either an appropriate-sized cardboard box or a 3kg satchel available from your local post office. Ensure you have securely attached the shipping label to the exterior of your parcel that prints with your order form.

Print a shipping form

If you can't print a shipping form, write your contact details on paper and ship them with your detector. Our shipping address is available on our contact page.

Select your model

Quotes and payments

Contact us for payment options and special quotes such as repairs and additional services.