For strictly street use and an AGPT28, BigT28 Killer, Big 16G or equiv (haven't decided that yet), is it better to go with the EVOIII Manifold and O2 housing and port them or just stick with ported stock Manifold and O2 housing? I assume it won't matter entirely because those turbos are very similar in power. Am I wrong? In addition, will most 3" downpipe's bolt up to a the EVOIII O2 housing? Thanks for your opinions!