Aprilia Mille, Mille R (02-04) and Tuono (03-04) Slip-On Exhaust Systems: Simply remove your existing exhaust canister and install a Two Brothers Racing canister for even more power (+4 HP at peak). Remapping of the FI system not necessary to produce increased HP when using a Two Brothers Racing exhaust system. Due to the extreme heat that the Mille R produces, we only offer the choice of a Titanium or Polished aluminum canister.