Hey everyone

Hoping someone can help me out...

ive recently installed a k&n apollo cai on my ah astra. it awesome appart from one thing. it makes a wierd noise when passing through 2500rpm to 3000rpm. it sounds like theres a hole in the exhaust or somthing like that. its not vibrating on anything as far as im aware as ive got it cable tied in pretty good and also got some soft velcro to take the shock out of the vibrations if there are any.

Does anyone elses do this? have i done something wrong in the install?

Thanks guys
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