2-into-1 Sideburners 2-INTO1 SIDEBURNERS Features The world’s biggest 2-into-1, with the best sound available VTX 1800 with 2-into-1 Sideburner makes a 3 1/2 hp increase over stock exhaust Outer primary tubes measure 2.5” Inner primary tubes measure 1.75” on most models 4” diameter collector 2.5” diameter perforated core Baffle is not removable