Did a search but not too much came up. What is out there for a high flowing system. Preferably dual setup but even a single 4 inch setup that won't resticted me too bad? I have seen the TSP setup. Decent price but I hear that it has some real bad resonance at certain rpm's. I also know about the custom stuff, I had that priced and yes it is an option. I just did not know what else was out there for a very good flowing system. Thanks guys.