Ground clearance is over 120mm. :)
Ground clearance at the back will be over 100mm aswell, just, with 3.5" Piping as the EGTs' would have dropped a fair way by then also. :P
Muffler is 3" straight through, 10" round and will be about 20" long, not using Stainless Steel mesh to protect the Absorption material so should quieten it down well...

Will update this post with a dB reading eventually, probably when the Staz gets done by the EPA. :D
Oh, and for the record, you can go 5" if you are happy to get it Ceramic coated instead of Heat wrapped.
Enjoy !! :beer
