I have a local fabrication company that is building a gate for my yard and I showed him the Spyder. I told him I wanted to put dual exhaust's on and make then horizontal instead of the up sweep. He told me that he has never worked with a Spyder, but has done a lot of custom street car exhausts and was sure he could do something that would look professional with the Spyder. He is supposed to be back with the gate in approx a week and will look at the Spyder at that time. I have looked at many exhaust mufflers and decided on the Bruce Fabrication product. My question now is how will the performance be effected by the duals. Should I upgrade or change anything?