Can I expect any noticeable gains from installing a K&N filter/flame arrester on my 496 mag?

I seriously doubt it, that being said, K&N is a great filter, but you can probably take the air filter off completely and won't see much gain.

Unless your original filter is just a clogged up really bad .

WILL

No change on mine that I can tell. It looks better though.

kinda what i am reading....just like the drop in for my truck, didnt feel a thing. But the cold air induction kit, now that worked for about 13 horse i undrstand.

Add some neon & a fart can. That's good for like 400HP! turn your hat sideways too - that adds speed.