I have the same setup. The Welter Performance rear exhaust doesn't have an adapter for the Hahn setup. Rear exhausts can also result in exhaust fumes being sucked up over the rear and into the cockpit if you have a Top and a taller windshields. Hahn offers what the call their Side Pipe exhaust which uses a smaller, and presumably louder) muffler that exits thru a hole in the side of the engine compartment. It costs around $900-1000 and when stopped at a light, the exhaust can still get sucked into the cockpit.
Several things I've thought about trying are -
- Asking a muffler shop if they can fab a small collector box that could be welded to the bottom of the muffler or the exhaust tips that would redirect the exhaust thru an opening in the side of the Slingshot. Like the Hahn Side Pipe exhaust, this may still allow exhaust fumes to be sucked into the cockpit when stopped at a traffic light.
- Buy the Welter Performance rear exhaust and have a local muffler shop fab the correct adapters to allow the waste-gate and turbo to be connected to the Welter exhaust.
- Convert a side pipes exhaust kit. This will still require fabbing of the adapters to allow the waste-gate and turbo exhausts to be connected to the exhaust. Dual exhaust side pipes are a little more work since the exhaust must be split and a second pipe routed in front of the engine to the driver's side pipe. It's also possible to just run a single pipe on the passenger side. You'll need a heat shield to protect your Wife's leg from hitting the side pipe while getting in and out of the Slingshot. The advantage of the side pipe exhaust is it exits to the rear of the Slingshot and while it exits at the rear of the Slingshot, it's exhaust would be exiting at the side instead of the rear and may not be subject to having fumes sucked back into the cockpit.
I'm facing problems keeping my license due to medical issues, but if I can keep my Slingshot, I'm leaning towards the single side pipe approach and am also considering adding one or two high-flow cats to help reduce the smell from the exhaust as my Wifde can't stand the exhaust smell.
This thread has a pic of a Slingshot with a side pipes exhaust (I assume a dual setup) - Need help identifying a Slingshot picture - Polaris Slingshot Forum
. I trying to find the current owner so I can ask for pics of how the muffler was mounted to the Slingshot and the length of the side pipe mufflers used.