RC:
Whoopsy:

Well, let's look at the 918.

most of the test cycle is on the electric mode, so it's silent. Which is why the loud stock exhaust can passed. I mean seriously, the STOCK exhaust system on the 918 will not pass the sound rules on Laguna Seca raceway on a normal track day. 

I do not know how the stock exhaust of my GT500 passed the sound emissions test in the US. Thanks god, there is no such requirement in Germany because it is an import car with an individual technical certification.

There are no stringent exhaust SPL rules in the US. Your GT500 and louder drive around just fine. The reference to Laguna Seca rules is specific to an area surrounding the race track. It's a stupid situation because the residents pushing that rule purchased/built their homes well after the race track being in existence.


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