well yes and no. A K&N on a stock 5.0 is worth 1 maybe 2hp. On the other hand you will never have to buy another filter again(just keep that one oiled good).
BTW, if you haven't already, yank the air intake silencer out. It's free and worth 3-8hp
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1987 Buick T-type
1998 HD Electra Elide
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