I dont think you will. You might get a little increased airflow, but mostly, it dosnt add more air(Charge), but increases the speed at which the air can travel through. There is no resistance in the exhaust. more air traveling through means more suction, which will pull more gas through the jet anyways. i dont know. You should try, and see if it works better with a bigger jet.
A note about what I said earlier.
Drilling holes in the baffle allows more air to get through, but it still makes the air have to change directions to get out. It is going full speed straight, and then has to turn to get through the holes. This still slowes it down.
Let me try to explain how I did this once that worked great:
I took two allen wrenches, L shaped. about 4mm ish.
I welded the short ends together tip to tip
This made a large U shape.
However, i welded them at a slight angle so that the ends of the U came in slightly, and the bottom made a bit of a point. It was a diamond shape at this point. but the long end of the diamond was still opened.
I then took a washer that fit just over the bolt for the exhaust, which holds the muffler on.
I welded it to the open end of the Diamond, so that each tip conected to the oposite side of the washer.
Then, I put the diamond into the muffler so that the washer side is towards the back.. The slight point that was made with the little ends of the L, goes into the hole, right up against the bolt which comes through it. The Washer side goes over the Bolt. The nut goes behiend the washer. You can now tighten the nut, and it holds the muffler in place. It also does not restrict the air flow very much(depending on the size of allen wrenches. You want to use thin ones so that it dosnt block the hole too much. This also allows the air to go freeley around it, and out without having to change direction.
This is fun to do because if you dont like it, or dont want it any more, you can just put it back the way it was, and no harm done.
Did any of that make sence?