The JB4 is the most advanced and highly featured tuning system available for your Toyota Supra Mk5. Power gains are up to 80hp to the wheels (100hp crank) on a completely stock car on pump gas for a B58, gains with bolt-on parts, higher octane, E85 mixtures, and larger turbos are even higher.
Is the 2020 Supra unreliable?
Is the Toyota Supra Reliable? The 2020 Toyota GR Supra has an above-average predicted reliability rating of four out of five from J.D. Power.Jul 24, 2020