For future reference: those that installed flow daddies on '00-01s, does it appear that the primaries are bigger diameter than the stock manifolds? When people opt to use 0630s and 7120s when they throw away the cracked 0331s, we need to be able to give advice what to do with the exhaust and the above header could be a good solution if it can cover the larger ports of the earlier heads(cheaper alternative to the Borla, which is also a solution).