There will be absolutely zero noticeable difference in lag/response by going from 2.5" piping to 2".
Ideally you should match the endtanks and both sets of piping to the TB... 2.5".
Everything is getting dropped off at the welder tomorrow, so we are officially done at the machine shop. As such, I need to start collecting balances so I can get the shop and welder paid up. We're looking to have the welding wrapped up next week, at which point they will be headed over to get...
These ones are actually port matched to the head, but unlike the first/second gen they can be ported out quite a bit. The runner itself is larger than the gasket opening, and it tapers down inside the main flange.
Just got home from being away for Easter weekend, and shot ya a reply... sorry for the delay there. All other PM's from yesterday and today replied to as well. I should have some nice picture updates this week for ya'll.
(rockon)