[RC3]

thanks mlai for your sharing.

your tom's has two muffler? For Hamann 528 it looks like this. Not a real quad. Hamann built by Supersprint and similar. Jxnco did a little research as below:

"That problem was solved by only allowing the muffler to have a single entry point just like the stock muffler, we then split the exhaust off from the muffler canister. Also, with the factory cats and piping diameter being utilized for the rest of the system, there will not be a substantial backpressure loss but instead an approximately calculated 6% decrease.

This particular setup was developed to give the aesthetically pleasing quad-tip look, a more aggressive tone that will not resonate back into the cabin, and a mild power increase of about 7hp and 3 ft-lb of torque."