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Reply to "tail light lense replacment"

Can't even guess how much increase you might get. Probably more from receiving cold air than ram-pressure air, and you lose about the same from increased drag. Ram tubes tend to often foul up carburetor mixtures, incidently unless you can somehow monitor the mixture. Its easy to go lean at the top end and you never hear the detonation that destroys pistons & bearings. Here in the US, we call them 'elephant-ears'. They are effective in grabbing air at higher speeds. At 150mph, enough air is scooped up to tear the entire scoop and window frame out of the body on at least one car. The stock window frames are only held in by gasket pressure. I suggest you run a few sheet metal screws thru the frames & into the body before you waste hours looking for your departed parts....
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