quieter exhaust that dumps into the tunnel?

[PaddleTracker]

I bought a 2006 Apex MTN with an MPI Supercharger on it and it came with a Excell Mountain Lite Under Tunnel Exhaust. I was wondering if anyone makes a quieter exhaust (quiet as stock or quieter) that still dumps under the tunnel. If so how much do you think I could sell this exhaust used for? Is this Excell exhaust good?
Thanks in advance!