I bet that put a smile on your face and probably added a little more top end power. I recently did a full custom exhaust on my car. I have a project to post that is an exhaust I just did on my brothers car. Both gained top end and a little mid range. Mine actually gained a lot as its got cams, p&p head and manifolds, larger valves. Looking at the pics, I assume you used a mild or aluminum/mild steel?
Jason
Everlast 255EXT - Perfection
Everlast PowerPro 256 - UPS Demolished
Everlast MTS200s
12 Ton Shop Press
DeWalt Hand Tools/ChopSaw