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W/O N2O or FI, be prepaired to open up that pocket book a little. Basically full exhaust, intake, ported/polished plenum, larger tb, cams, and ported heads is what you'll need to get there. I'm still learning the 4.6L, but approx 120 rwhp isn't cheap or easy to come by, and 4V Cobra parts are EXPENSIVE!!! I could build 2 5.0s for what it cost to build one 4V, prices are obsurd sometimes.
400 bhp would be slightly easier, but like I said, without F/I you're not going anywhere easily or cheaply. A supercharger would be the easiest way, but then again you run into the problem of the 99/01s not having forged pistons or rings, so you'd be on borrowed if you run any modest amount of boost (larger than 8 psi).
400whp N/A doesn't happen on the stock 281 without cobra R/ Fr-500 intake/heads, those alone will cost more than a blower set-up, don't run from forced induction.
not to mentions cams set you back another $1200, valve springs ~380, trust me, i looked into it, its NOT worth it.
I bought a goldfish, named it after my ex-girlfriend, and let it die. It's really the little things in life.
Police in dallas are giving local drivers cowboys tickets instead of speeding tickets
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