Hello, I am working on a custom car project, and will be using a Subaru WRX 2.0 liter turbo charged engine. I did a search under the question I am looking for an answer to, but only found one thread that was closed. I hope you all might be able to educate me, on what my possible options are. I would ideally like to find a way in a very short exhaust system to modify the exhausts pulses, and tone. I am working on testing the feasibility of a bypass system like used in the Astin Martin Vanquish. A throttle reactive bypass system that allows the car to be civil under normal use, but emits a nice growl when things get fun. However, I would like ideally to remove the trademark Subaru STI Drone associated with most performance subarus, and lean more toward something that sounds more exotic, and less of a pulse to it. I do like the bass level on the exhaust though. I know I cant get something for nothing, and my options are limited. Would there be anything that could modify the acoustics of the exhaust that I could do? Maybe changing diameters, etc. Im even willing to make my own muffler/resonator etc. I'd just like to learn a little more of what I can tweak to make this car sound a little better. I have access to Catia V5R to run some simulations. If it might help let me know. Id like to be as educated as I can while approaching the design of this exhaust for the est possible results. Thanks in advance.