GM Gen III / downloadable cam tunes

Gen III Texas Speed Chopacabra downloadable tune files

Hear a 5.3L Silverado running the JRJ Chopacabra downloadable tune. Find files for 1999–2006 Silverado and Sierra pickups, plus the listed Tahoe, Suburban, Yukon and Yukon XL applications. Choose your exact year and engine below.

HP Tuners .HPT files READ FIRST PDF included Match your vehicle and engine

Gen III Chopacabra — 5.3L Silverado

This 5.3L Silverado is running the JRJ Chopacabra downloadable tune offered here. The example truck has long-tube headers and exhaust; sound and results can vary with your engine, exhaust and setup.

Your vehicle. Your engine. Your file.

Choose your Gen III download.

Looking for another generation?

Available listings for Silverado, Sierra, Tahoe, Suburban, Yukon and Yukon XL. Open your vehicle below or filter by year and engine to find the file you need.

Chevrolet Silverado1999–2006 · 24 file listings
GMC Sierra1999–2006 · 24 file listings
Chevrolet Tahoe2000–2006 · 14 file listings
Chevrolet Suburban2000–2006 · 14 file listings
GMC Yukon2000–2006 · 20 file listings
GMC Yukon XL2000–2006 · 14 file listings

Check the file's controller and operating system against your vehicle's original read. Review the product details and installed hardware before choosing a file.

02 / KNOW WHAT YOU’RE GETTING

A file with a clear
next step.

The selected .HPT file comes with the JRJ READ FIRST guide and tutorial. See the guide before you buy.

  1. 01

    Keep your original read.

    Your vehicle’s stock file stays the starting point.

  2. 02

    Compare the selected file.

    Follow the guide to review differences in VCM Editor.

  3. 03

    Review what fits your setup.

    Transfer only changes confirmed for your vehicle.

Inside your READ FIRST guide

Open full PDF ↗
Page 1 of the approved JRJ READ FIRST customer guide

Before you download

A clear path from file to review.

What comes with a downloadable tune file?

The selected HP Tuners .HPT file and the JRJ READ FIRST PDF guide. The download does not include a camshaft, tuning interface, vehicle credits or a custom remote tuning service.

Is the vehicle name enough to choose a file?

Use the vehicle, year and engine to narrow the directory, then review the actual product and file details. Controller, operating system, installed cam, injectors, fuel and other hardware must be compared with your own setup. Keep an untouched copy of your original read and follow the READ FIRST guide.

Will my truck sound exactly like the video?

The video shows one vehicle and setup. Engine, exhaust, installed hardware and operating conditions affect the sound and result; use the example to hear the cam, then choose the file by its actual application details.

Explore the broader cam download hub for other listed vehicles and generations.

All Chopacabra downloads