Quote:
Originally Posted by Gen6cyl
No they never hurt anything I could tell. The only ones it helped was my 06 Acura RSX-S and possibly xr250.I had a 2016 focus st I bought new and put 93 k miles on.I put catless downpipe,bigger intercooler on.Had a green filter and k&n filter for it. At over 80 k miles I put a paper in that I had taken out years ago, in good shape. I could not tell any difference.
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That's my point, even if you weren't interested in any performance gains, after 2 air filter changes/cleanings it pays for itself.