SR1433 Muffler Retrofit?

[wormst]

I'm looking to put a double bagger on my SR1433, but it looks like the rear "bumper" where I would attach the bagger has been cut off to fit a larger muffler. Can anyone tell me from the pics if the Kawasaki engine is the original engine, and if so, was there a different muffler?

 

[Mow Joe]

I'm 99.376% sure that the original engine would have been a Kohler.

 

[briggs]

I'm 99.376% sure that the original engine would have been a Kohler.

some came with a Briggs also but most were Kohler