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6 hours ago, 87sheerips said:

I hear that there are 0 HP gains between a 2" long filter and the 10" or whatever those long donkey dick ones are.  I used to run 4" on my drag bike they were convenient.  

 

FAST is great people.

 

There's a builder who did a comparison. They actually found 4" filters made the same power as 10". I can't remember who did it, but I remember seeing it on here.

 

 

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