hmm
I"m not sure but I think they're trying to say that the NA blow off valve sounds similar to a turbo blow off valve
but I could be wrong, they could be sayign that a turbo blow off valve sounds like a NA blow off valve.
Although if read differently you can read it as a na blow off valve sound like a turbo blow off valve
thereby using the communicative rule you could say the na blow off valve sounds like a na blow off valve...
although I could be wrong
LOL