SuperTrapp 2:1 SuperMeg ExhaustsEfficient 2:1 system increases torque and horsepower. Unique 4 disc mega system allows custom performance tuning to match any engine. 2-1/2" collector provides maximum flow even on big bore motors. Triple chrome-plated and show polished. Full coverage heat shields including collector. Billet ring end cap. 2007 models have O2 sensor ports. "