Need Exhaust Recommendations

While it was on the rack, I sprayed the inner intermediate pipes black to see if a hot spot appears. I have a feeling I won't see one. If not, one will be cut-in in the usual space. The shop was fine with the installation except for the initial downpipe size. He used 2" for the initial 16"-18" of the downpipe. Performance-wise, I noticed a substantial difference in the lower-mid range. I knew there was some restriction taking place and I honestly believe that the additonal flow has made a positive difference..