What they didn't do however, is use mandrel bending techniques to steady that 2.5" throughout the entire system. And per regulation, they also supply the system with restrictive catalytic converters.

Brothers Performance comes to the rescue! With high-flow cat models and even off-road models, we have stock-like 2.5" systems, as well as 2.75" units from BBK – for those pushing gobs of horsepower down the track.