hi,
I have an 05 convertible the Magnaflow resonator and muffler installed. The performance results are not overwhelming but the motor does seem to spin up easier. I also installed a drop in K&N filter. If I keep my foot out of it I get better mileage than stock by an mpg or two. I had the resonator installed after a couple of weeks with just the exhaust pipe. Since I have a convertible I found the freeway drone a little annoying. With the the two magnaflow pipes installed I get a very throaty sound that is quiet at freeway speeds. My guy did not recomend the Flowmaster as he had done one before and it was to loud for normal driving.
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