text: The turbocharger was a reverse rotation Mitsubishi TD04LR-15Gk with a  turbine inlet. Tight packaging forced some creative thinking on the turbocharger. The TD04 compressor has a compressor bypass valve built right into the compressor housing. The exhaust manifold and turbine housing were cast in one piece by Mitsubishi from high-nickel Ni-Resist steel. The one-piece design improved flow, reduced size and reduced thermal mass for quicker cat light-off. The turbine discharge was also part of the manifold/turbine housing casting, and it looped back around and hit the manifold again on its way to the catalytic converter. Where they met, there was a wastegate valve; keeping the wastegate valve away from the turbine housing improved flow where it mattered most. Maximum boost in stock form was around . Piston velocities and valve-train components force a rev limit of 6240 rpm although MOPAR upped the ante with their Stage 2 and 3 kits which have a rev limit of 6500 rpm.
  The exhaust system for the vehicle consists of  steel tubing, which is run first through the catalytic converter, then through two resonators. The exhaust then splits into two separate sections of piping, exiting through two  stainless steel tips at the rear of the vehicle. The exhaust system is unique in that there is no muffler, instead relying on the turbocharger and resonators to reduce the exhaust volume. The result is a very distinctive and audible exhaust note.
  ACR model
  This factory competition version included:
  Wider 16×7-inch (410×180 mm) BBS RX racing wheels with  offset
  Wider 225/45/16 BFG KDW2 tires
  Lowered ride height (Front:  from spring seat lowering, additional  through smaller diameter tire; Rear:  from spring seat lowering, additional  through smaller diameter tire)