This is 3" GMS adapter to connect GMS 3" Midpipe to OEM rear standard or race exhaust silencer. With this combo you get the best of both worlds. The GMS 3" Modular exhaust components will provide unmatched flow, weight reduction and eliminate the heat soak issues, while keep the car stock looking on the outside and effectively keep the noise dB levels low.
 
This is part of a fully modular GMS 3'' exhaust system and can be combined with all the other GMS exhaust parts you need.