It is probobly some sort of manual boost controller... but not meant to control the boost meant to increase the time it takes for the wastegate to open...
it would allow the turbo to spool faster but not over boost.
that'd be an easy 10hp no prob. (10hp down low not peak). It would make the car drive better... and probobly wouldn't do any harm...
Most of them are scams though... that or just simple info that you prob. already know or could find out with a little learning.
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