Exhaust port service for 12a/13b naturally aspirated engines. These ports have been developed over years of research and testing. Provides a excellent wide powerband that does not reduce bottom end torque. Once purchased please send your two rotor housings for the service. Return shipping to be determined by location.
13b street/race exhaust port service. Naturally aspirated
Once purchased please send your two rotor housings to Defined Autoworks for service.