# Ringbrothers Build 650-HP Pontiac GTO

> Ringbrothers spent 5,500 hours transforming a 1965 Pontiac Tempest Convertible into a 650-hp GTO with carbon fiber and custom parts.
- Title: Ringbrothers Build 650-HP Pontiac GTO · Motor1 | Shortify
- Summary: Ringbrothers spent 5,500 hours transforming a 1965 Pontiac Tempest Convertible into a 650-hp GTO with carbon fiber and custom parts. Ringbrothers completed a…
- Keywords: ringbrothers, pontiac, gto, sema, carbon fiber, 650-hp, cars, Build, Motor1
- Source: Motor1 — https://motor1.com/news/814130/ringbrothers-pontiac-gto-sema-show-build
- Author: Anthony Alaniz
- Published: 2026-11-02T20:48:32+00:00
- Read time: 1 min
- Topics: ringbrothers, pontiac, gto, sema, carbon fiber, 650-hp, cars
## Project Start
Ringbrothers began transforming a 1965 Pontiac Tempest Convertible into a 650-hp GTO.
## Body Modifications
The car received a five-inch wider body and reshaped front fenders, rocker panels, and rear quarters.
## Carbon Fiber Use
The hood, front wheel tubs, lower front valance, and rear diffuser are made from carbon fiber.
## Custom Exterior
The car features a custom Billie Goat Blue finish with polished chrome accents and black detailing.
## Engine Details
Under the hood is a supercharged 6.2-liter LT4 V8 from Wegner Motorsports producing 650 horsepower.
## Interior Upgrades
The interior includes custom aluminum trim, Dakota Digital instruments, and a restored factory radio with bluetooth.
## Key takeaway

Ringbrothers completed a 650-hp 1965 Pontiac GTO Convertible after 5,500 hours of work at SEMA.