I started prototyping the product out of 1.5 inch diameter PVC pipes and cut a piece of 12 inches and 7 inches respectively. I then made a separate cut-out on the 12inch pipe from where the second piece would fit into. Since I used a dremel machine for this, it was very easy to make the required cuts using the saw tip of the machine. 

For the main product, I used 14 gauge Stainless steel pipe and first tried to bend it in the desired shape of the exhaust system. But since the pipe was too thin to be curved, the pipe pinched and deformed. That is why I used the pie cut method which consists of the pipe being cut at an angle and then being welded together to obtain the required bend. The cut angle was 15 degrees. 

After cutting all the required pieces, with the help of a technician, I welded the pieces together using TIG welding because it is the best for stainless steel as it does not create any pores.