I'm making the switch to b1 originals on my 511. Gonna try to modify my TTI headers to fit. I might build some headers but not sure If I want to go that route yet. I was gonna do a small upgrade in heads but got a pretty good deal on a used B1 topend. That way I won't be limited when I decide to go bigger. I'm thinking there is a good chance they bolt right up. The TTI's didn't fit well with the E heads anyway. Should fit better with raised ports. I hate fenderwell headers so that option is out.
Gonna see if I can get a low comp 511 to work with B1's. Peak power was 6400 with cnc E heads, converter stalls 5900, crosses the stripe at 6600. Should move the power up over 7000. Should make the rest of the combo work better.