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· Premium Member
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what is the difference between the type of air filters with the closed end and open end. For example, SPECTRE P2 CONE AIR FILTER vs SPECTRE P3 CONE FLAT-TOP.
Looks and sound mostly.

You're not going to make enough power to outflow the cone. I've had both open and close top K&Ns and it's sound. The open gives more of a whoosh turbo-ish sound while the close gives a growling sound.

The open top cone does flow better but again when you're talking about 1200CFM and 1300CFM while you're engine only needs a max of 800CFM it's not going to do much for performance. (Numbers pulled outta my arse for example).
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