The consensus is that drag pipes are very difficult to tune and always give poor performance on the Savage. There's a dyno testing video that has been posted before that tells the drag pipe tuning tale but I can't find it now....

However I dig the look as well, so if you don't care about performance, go for it, at a guess a couple of sizes on your pilot and main jets will get you close.

I can relate my experience with a Raask 60mm pipe.  I'm only using the main outer baffle.

Raask recommends going up two jet sizes when installing the pipe.  I installed a Dial-A-Jet.  DAJ recommends going DOWN two jet sizes when installing their unit (to force the engine to run lean, y'see).

Bottom line; no rejetting, bike runs sweet, and a dyno said it was putting out just a hair shy of 30 horses.  The only other modification I made was the complete removal of the white spacer and popping out the brass plug on the carb and richening up the idle.  It doesn't backfire anymore now either and goes like stink.  Accelerates fast, plenty left at 75 mph and the engine doesn't act like it's going to have a stroke at expressway speeds.

I went with the Dyna, baffles still in it.  I cannot be happier.

I did have someone make a custom piece between the header and the muffler out of stainless.  They also took the bracket off the stock or moved the Dyna one then put it on the Dyna for a nice fit.  They charged me $120 to do the work which was really reasonable.