in the included pic, this is my new dynomax cat back on the right, with two bolt flange, and this is my straight pipe that replaced my cat. whats the best way i can put these together, i also have 2 header flanges. 3" to 2.5" with gaskets, and if i need to, i can buy another 2bolt flange. my exhaust is 3" whats the best way to join these pipes together? without welding.