Stock airbox and paper filter will flow 400hp+ you know, so any gain will be marginal if at all.
I have a green panel filter in my golf with a cold air pipe form the bumper and its gone rusty wiht the damp air getting in!
Will tyr a k and N next I think or put stock one back in.
Fresh paper is just as good as "high performance". And about a fifth of the cost. And they don't need maintenance.
You also don't have the risk of atomised oil particles getting through the intake system.
I've tried a few performance types but prefer regularly changed paper.
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