I had one on my first VW (66 bus).
My evaluation at the time (NOTE: I was 16) was that it was louder than my old generic 1.75" inlet muffler regardless of how many disk I put in and it took me about a car length longer to get to 60 if I "tuned it for best performance, and 10 more car lengths if I tuned it for lowest noise.
Of course I went back to the generic one which for all I know was a super muffler . . . .
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2016 Tesla Model X
2022 Sprinter
Gone 2012 Tesla Model S P85
Gone 2013 Nissan LEAF SV
2012 Nissan LEAF SV
6 speed ALH TDI Swapped in to a 2003 Jetta Wagon
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