Hey everyone I just installed a new k&n conical air filter into my 2002 GP GTP. Since the install every time I turn my engine on the air filter starts sucking in air and sounds vacuum like. Now it does stop the noise after about 30 seconds to a minute. If I start driving before it stops I can hear it when I am on the gas (going around 15-20 mph because I live in a neighborhood with lots of children. It goes away though in 30 seconds to a minute driving idling. Doesn't make a difference. Basically my air filter didn't do that when it was stock.
Now i do not know if this makes a difference but I had to leave half the stock air filter in so it could hold the computer system that sits in the stock air filter. I couldn't find any other way to keep it safe. So I was thinking maybe it sucking is being echoed by the old half of the old filter... I'm probably way off but I really don't know what to think.
So please and thank you for taking the time and possibly posting a solution off suggestion.