A tune is the biggest gain per dollar on any B58, and it's where every build starts. The hardware you add later (downpipe, fuel, ethanol) only pays off with a map that's built for it.

Flash tunes (bootmod3, MHD) rewrite the DME's maps and give you off-the-shelf Stage 1, 2 and 2+ maps or a custom tune. Piggybacks (Burger Motorsports JB4) plug in between sensors and the DME, unplug for dealer visits, and work on cars that can't be flashed yet.

Not sure which one fits your car? Read bootmod3 vs MHD vs JB4, or use the VIN lookup to filter this page to your B58.