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Pontiac GTO mods

The US GTO, all three years.

Your GTO

YearTransmission

Pick your year to see what fits.

This page covers the US GTO.

Engine 5.7L or 6.0L V8

Stock ~350–400 hp

Weight ~3,700 lb

2005

Sort by

Power

+8–14whp est. · More air

Medium$300–$3501 hr

Sound

+5–10whp est. · V8 sound

Hard$1,600–$1,6002–3 hrs

Handling

Lower and flatter

Expert$700–$1,0005 hrs

Handling

Flatter cornering

Medium$200–$2001–2 hrs

Brakes

Stronger stops

Medium$609–$6093 hrs

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HP numbers are wheel-horsepower estimates.