Quote:
Originally Posted by MaDMaXX
The ART's are resonated test pipes, but you're right, others can help with the rasp too.
ART's just add back some of the power and torque you lose with other test pipes.
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No. I have seen data that they make 2-4 more whp than regular test pipes, resonated or otherwise. That's about it tho'.
They probably just flow a little better due to the unique resonator design -- other than that, you can't flow much more freely than an open pipe.