When I looked inside the pipework on our 'new' landy I found a previous owner had fitted hyclones - I wouldn't have know otherwise - much less power on the new 300TDi compared to my old Disco 200TDi engine in the ancient 110... Well, until the injectror pump was turned up anyhow - that's the thing which really transformed the motor, and it's still clean burning and the same fuel consumption!
I wouldn't bother to fit a Hyclone - I'd rather fir stuff which has a real function rather than magic bits of bent tin!
I have fitted a K&N air filter, but it's an oiled one - I got it to catch more dust in the oil rather than for performance (which again is unchanged...)
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