ill start off with some background, stage 1 cam /ported exhaust /mostly straight through slip on exhaust does have some baffling tho/ running a "U" intake tube from air filter to carb, the VM has a UFO and dial a jet.

it runs great at idle except the odd stumble when its hot, pulls strong as long as im giving it more throttle all the the way to wide open  ,if i try to hold it at 1/4 throttle it stumbles alot and pops and cuts out but keeps on truckin. pretty much the same thing happens at any throttle position if i hold it in one position for too long (sucks for trying to keep a steady speed) another thing that happens when i come to a stop i have to give it a little throttle to keep it from dying completely. seem to be burning more gas than average too.

any ideas would be helpful. thanks in advance

Sounds like slide maybe sticking,or jet needle needs adjusting. Did it run right at one time.

dave everything except the exhaust was done over the winter, when i took my exhaust off to take my right side cover i broke the mounting bolt off the slip on so i ditched it for the new more straight through one.

bill67 it ran perfect before the winter haha, it turned over first shot when i put everything back together but ran terrible, runs pretty good now except for this issue, ive been running it the way it is for a while now just to be on two wheels, i would like to get this fixed before i have to put it away for this upcoming winter

Do  you still have the stock carb in the corner of your garage somewhere?  Am I asking too many questions?

Have you reead the thread oh the UFO?
http://suzukisavage.com/cgi-bin/YaBB.pl?num=1149364740/0

If the exhaust is the only thing that changed, I'd start there. Sounds like a more straight through exhaust with your set-up is going to make your bike more of a race rocket, and also much less road-friendly.
Maybe there's a way to add more baffling and/or more backpressure to your new exhaust to bring it back closer to your original setup?
I assume you re-jetted the carb when you installed the new exhaust... maybe go back to your first jet settings and try to tune the exhaust to fit your jetting rather than the other way around (I know that seems totally backwards, but you might get a more user friendly experience from dialing back your set up a little bit...)

Yeah... you've got a lot going on...  

Actually, I'd like to know what you mean by a "U" shaped intake tube; do you have a picture of that?

THAT looks the business for sure!
I don't want to hijack your original topic, but I'd love to know more about how you came up with this thing, how you jetted the carb for it, how it works etc.... I might just have to copy you when the time comes. Got a lot of other projects ion the bench right now...