I have a 2 into one on my race bike bike mainly as it became available and seemed like a good idea. Its unequal length and the 'muffler' has been gutted and a plate with holes fitted....its very quiet...road legal quiet. Last weekend I had a ride on a r100 with 2 into 2 and owner/rider/builder said " look at any pictures of BMW racers and they have 2 into 2. The bike goes well but it would be good to compare. Any thoughts ? I have ditched the filters and am waiting on trumpets from Bevel Heaven.