As Mo mentioned (by the way I'm also happy to have him back! For those that don't know Mo was one of the first guys to give the B5 a shot on RC Tech so it's great having him back as part of the family!) the extenders for the 2057 fits between the pip and manifold and in essence does justbthat, extend the pipe. The longer the pipe the more back pressure it creates making more bottom end. The shorter the pipe (as in if you run the 2057 without the extender) the less back pressure it creates producing more top end. This is one of the realy neat thing about the 2057, you in essence get 2 pipes for the price of one! The way that I recomend people to start off when using the 2057 is with the extender installed. If after running it for a bit you feel that yo still have more than enough bottom, pull the extender out and it will smooth out the power band even more!

DPowers, it sounds like you have changed most of the stuff that I would have looked at to start with. One thing that you did not mentioned is what type of temps you are running at but just a suggestion. If with all of the new stuff next time you run you are still getting the bog after a few minutes try richening up the needles a few hours and see if it gets better. It's possible that you might just be a little on the lean side and after 4-5 minutes once the engine realy comes up to temp you are seeing this. When I tune I generaly do it so that the engine is slightly fat off the bat. When I do this I find that after 1-2 laps (like in your typical warm up) the engine then comes up to temp, clears out and will stay realy consistent for however long the run may be. If the motor is realy crisp right off the bat when you just fire it up, this is usualy a sign to me that the engine is on the lean side. Jet something to try. Let me know what you find once you run it again.

Regards,

Ron