Review on π Borla 40351 Performance Muffler by Eric Mueller
Muffler Borla Drone
Installed these mufflers Borla 40351 on my Lexus gs350. Unfortunately, there's a decent amount of "low hum/hum" from the drone at around 2-3,000 rpm, which equates to 70-80 speeds on the freeway. I used to remove the muffler and it was louder, but all the reviews online and on forums said they have no hum. 1500 km driven, the noise is the same. Can reset normal silencers, time will tell. I also had a Helmholtz resonator welded on, which didn't help much even after calculating the required length.
- nice thing
- I don't remember but there was something
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