Basicly the pipe is invisible at the moment. Its little bit inside the sideskirt so if you are standing next to car and its turned off you wont be able to tell where the pipe is located. When engine is running you can smell the fumes on the drivers door its difficult to tell where the exit point is on the noise at idle.
I would not feel safe to make the exit on the center tunnel/underl of the car. There is too much risk to get fumes inside.
I will get back to this exhaust pipe thing in the future and might test few possibilities. I also got a tip of this kind of product:
MICROTEX HT Lightweight Acoustic Absorption Material for Automotive Exhaust Silencers
I sended a enquiry but no response yet. If I am able to get this stuff pipe will go all the way to back.