At one time there were 2 different Flowmaster transverse systems on the market. The Force II and the American Thunder. I have both systems here and have run both of them on 2 different cars.
The Force II was a mellow system, nice sound, no drone. However Flowmaster quit making this system several years ago, so it's been off the market for quite some time.
The American Thunder system lives up to it's name. It was friggin loud ALL the time no matter what, and had a ton of drone. I never liked it at all.
Unfortunately, and why I have no idea, Flowmaster only sells this American Thunder system now.
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