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I installed the Flowmaster today. It was a synch to put in, about 20 min. When I went out for a test drive I liked the sound until I stayed steady between 2600 to 3000 the drone was very loud and I do mean LOUD. This is normal cruising speed, 55 to 62. Going up hills or picking up a little speed made talking impossible. Called
Flowmaster and got the out to lunch voice, so we call people we know at other companies. The basic response was that most of the larger companies use "off the shelf" low restriction mufflers for their hi-performance systems, most have resonant points. When we did get in contact with Flowmaster they said the drone was normal for their systems and that is why they are called American thunder. When I asked why they were good everywhere but cruising speed, same answer. Then he suggested that I buy their resonator. when we looked at the specs There was no way it would fit our cars.
We came up with a plan B. We cut off the stock pipe at the back end of the second resonator (yes we have two) and cut off the front of the second mid pipe from Flowmaster and welded them together. About 80% improvement in the drone, no rasp, nice low tone, and nice look. I have no idea about power changes.
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