I am looking to improve my 1.6 na exhaust with a dual outlet manifold and downpipe. I am also looking at upgrading the whole system to 2 inches. So, TT has the 2 inch system, but "cat back". What do I put in the gap between the down pipe (3 bolt flange) and the front end of the TT piping? Is the old flex pipe for the 70's rabbit a good idea/start? It looks like that will bolt up fine to the downpipes, but what about flow? I know I need a flexible joint in there somewhere. Thanks in advance!