ok i took off my bov few days ago and put the stock dv back on. the car went to stock performance when it was 93 oct chipped apr. could it because bov was bigger holding more boost. i am about to purchase the 710n valve. but just out of curiosity.

Also when i took the bov off there was oil on it. looks like dripped from the top of the bov. what could it be any ideas or which gasket?

 

get a 710n or a better one, anything is better than a bov