I didn't use this long before I bought a complete Tsudo exhaust system from SE Motors for my MY 14 2.0 Base Impreza 5sp MT. However, in the short time I've used it, it was apparent (also noticed by my father, who has driven my car in the past) that it gave the car more low-midrange power. I did this in a dry stream at the same time as the aem drop air filter. For around $40-$60, depending on how good the deal is, you get a better exhaust note and more low-end and mid-range power. You can't beat the odds and put a smile on your face when your boxer goes from a Prius-like sound to a boxer just by simply removing the muffler and that little straight pipe. Not to mention surprising yourself and maybe the passengers with what such a small thing could do with a car's small torque. I would estimate 5-7 hp. dependent on RPM, but I couldn't register it with my OpenPort2.0 while I had it installed. It was easy to see after driving the same car for so long. You just have to trim the bumper a bit as it ends on the other side where your exhaust tip normally comes out. At least for my make/model and year.
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