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I run a normal round 14x3" air cleaner on my car 24x7. Its not any faster with it off.

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I only tried with it off as I had a friend who harassed me that I was leaving e/t on the table...it was hillarious that the car slowed down instead when I tried though, he had nothing to say at that point lol

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Ya ok did you tune the carb with the air cleaner on?if so shoulda tried rejetting it when you pulled it off ive never had a combo run slower and ive been doing this for 29yrs.maybe you have some type of turbulence issue with the hood your using then the air cleaner might help straighten it out and your using a very large breather but in my experience ive see usually a tenth to 2tenths when off especially when using a drop base style.i think there was only one experience when i seen no difference when i pulled the cleaner off but then again ive never been fortunate enough to run such a tall breather on any of my combos.

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I guarantee he didnt rejet.... ALL air cleaners have
some sort of restriction .. even the very best...
I flowed so damn many air cleaners at work it was
sickening... every type out there

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i'v tried this on a chassis dyno once. removed a 14x3 k&n and lost 2hp. put it on and gained it back.

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i bet you didnt rejet either........
ok why dont all these engine builders out there use air cleaners when they are dynoing motors if it gonna make more power?in certain competitions its actually a restriction when told they have to run air cleaners and mufflers......so in theory motors should make more power with mufflers then too