Hi M8,
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1.
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Yes you have to drop the tank to do replace the pump.
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Just dropped mine.
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It took me 2 hours.
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I would expect a decnt mechinac with access to a lift could do it in under an hour.
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2.
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If your aiming for that sort of power i would look at something aftermarket, i'm not sure if these guys sell fuel rails for rev3's but take a look
www.wolfkatz.com![](./images/smilies/spacer.gif)
.
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The standard rev 3 rail is meant to be quite good though, not sure it's good enough for 450hp? I would think for 450hp you would need an aftermarket fuel pressure regulator
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(aeromotive etc).
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If you fitted one of these you could fit the injectors and turn the base fuel pressure down until you got to the tuners and then they could tweak it
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(this is what i will be doing with my rev2)
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I think bhp is the factor when looking at fuel injectors.
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You could have a massive turbo running 15psi and pushing loads of air into the engine, it would need as much fuel as a tiny turbo at 30psi for example.
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HTH