Over the Axle Pipes

I will be picking up my dad's wagon very soon and want to get started on putting togther an exhaust setup. Right now I am thinking Pypes X-pipe and Hooker Aero Chamber mufflers exiting behind the rear wheels.

I am just wondering what to do about the OTA pipes? If I order the Dynomax pipes (WLK-54016 and WLK-54017), what will need to be done to get the tips to exit behind the rear wheels? Looking at the pictures, it looks like some cutting will need to be performed?

Thanks in advance! :-D

The walkers will work OTA, but will need to be custom fitted once it gets to the gas tank. Pretty simple for a muffler shop to do. The most difficult part is the OTA proper. It "corkscrews" over the axle as opposed to just doing a 180.