I have I Opel corsa utility 1.4. I wanted to put a cone filter in, but then a guy told my that ill get the same if I just bore holes under my air filter.
How many sould I bore and how big must they be?
This question isn't too too clear. I think, if you want same performance, or, better, you need to make inlet holes to cone filter same or bigger than stock intake. Look at the stock intake snorkel. Get a 3/8" drill and approximate by eye how
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