Cannot comment on the current manifolds. The injector throttle bodies TWM uses are very nice - much better linkage than the Hilborn stuff has, although the cable wheel in the center is a bit odd and sometimes difficult to connect. Supposed to look like Webers. The BT intakes they used to use are very small on the ports without a lot of room to open them up. Stacks are cool, but air filters will flat out KILL the power and make them run really, really rich. Best to run filters on the street with a different EFI map and change them out for any race work. I use a FAST xFI or Big Stuff 3 controllers. The bank to bank runs surprisingly well - - sequential should not be as big a deal with an IR system since there is no shared plenum or varied runner length - probably helps at part throttle and transitions. IR stuff opens up a lot of throttle blade area with a small move of the throttle - you might have better luck using MAP rate of change for acceleration enrichment instead of just using TPS rate of change like on a single throttle body setup.
