Looking for experience with under tunnel exhaust

It's getting time to bring my 07 Attak into the garage in anticipation of a hopeful early winter. I have some maintenance that I need to do like check the exhaust donuts etc. I am thinking about a couple of upgrades like a 13mm sway bar and possibly the steering blocks that I have read about in the forums. I am curious about under tunnel exhausts. Not looking or expecting a power gain, more interested in just trying something different to change the look of the sled. I think I'd go with a streetbike can hoping to keep the DB's down as low as possible. If any one has any comments on fabbing up mounts etc that will hold up to the bumps, vibrations, and all of the rigors of varying trail conditions I'd surely appreciate the input. Also if you do change out the exhaust what is to be expected from the fuel injection/throttle response. I have read in here that changing the exhaust often requires some additional work relative to fuel delivery.

Thanks!

I've done this mod to mine along with other's and it great. I've put in a yoshi rs-3 pipe under mine and its not loud. Easy mod to fit too with no ice build up.
I'd say at least a 5hp gain.
niko.