Just to point out that the Top Speed stuff is QUALITY.. not different from the other brands. Sorry DE not sure what your going on about, i guess speaking from no experience.
Ive seen / heard both these setups on and off cars.
I also ran the M2 style system myself before and it was great. Quiet when needing it to be quiet but picks up when you want it to pick up.
The Axle backs are for sound, but wont give much on the performance side.
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