The stock pistons have been swapped in favor of Arias 8.0:1 compression units. The engine runs plumbing from a mid-'80s HKS upgrade package. The current turbo is a secret-spec T-Series unit from Innovative Turbo Systems. Maximum boost pressure is 26 psi. On top of the 26 psi of boost pressure, Matusevich can squeeze an extra 110 hp out of the Supra at the touch of the button.