Non-resonated (louder) for fitment to the OE downpipe

Resonated (quieter) for fitment to the OE downpipe

Non-resonated (louder) for fitment to aftermarket manifold

Non-resonated (louder) for fitment to the OE Cast Manifold

Resonated (quieter) for fitment to aftermarket manifold

Resonated (quieter) for fitment to the OE Cast Manifold