We had a customer stop in this week looking to test the power difference between running the exhaust on his Viper GTS with and without resonators. Unlike the exhaust resonators we sell which are a straight through design, this customer had purchased resonators which featured a design I had never seen before. I’m not sure what brand they were, so I’ll try and describe them the best I can. The exhaust on this car is 3″, which the resonators were designed for. However, when you looked into the resonator you could see they were straight through, but the inner straight through tube was definitely smaller than 3″, unfortunately I did not have a chance to measure it, but it looked significantly smaller than 3″, perhaps 2.5″? Surrounding this inner tube is what can only be described as an auger, a metal corkscrew spiral. According to our customer, the design splits the airflow with half the exhaust stream passing through the inner straight through tube, and the other half passes through the auger section. I can attest to the fact that these resonators did seem to tone down the exhaust when installed, unfortunately they also robbed quite a bit of power. After seeing the results our customer decided he is going to run straight through resonators which should help keep the exhaust tone in check, without sacrificing power. This Viper is stock with the exception of a full aftermarket exhaust, including headers.