I'm looking at buying a Jardine GP1 slip on for my 09 GSXR 600. I've checked out various forums and people say they are very loud. You are able to buy them with or without mufflers. Does anyone know if the loud ones have been installed without mufflers. I don't want my bike to be stupidly loud but I think the GP1 looks cooler than the R55 that seems to be quite popular.

If anyone knows someone with a Jardine GP1 please let me konw I'm itching to get my stock muffler changed.