You'll know for sure when you try, not that expensive. This wasn't even designed for the GS, it was designed for the LS high pressure fuel pump, but it fits because they use the same fuel pump.

 

I just installed both covers (taking out the battery helps a ton for space in the engine bay, at least for me lol) on my '08 RWD GS350 and it's sounds the exact same tbh. I was really looking for the 30-50% reduction like others had said but not too much of a difference tbh. Maybe it's a placebo? :/

Best, Norm

 

It either helps reduce the noise or it doesn't . Maybe people are expecting too much.

A simple decibel meter app would answer this , because numbers don't lie.

 

what a brilliant answer!