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What gains to expect?

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Old 01-12-2007, 12:01 PM
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Question What gains to expect?
What kind of gains (rwhp) can I expect with a Fast 90 manifold/professional products manifold and underdrive pulley? I'm still on stock head castings, LS1 intake and stock pulley. My rwhp is in sig. Thanks in advance.
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Old 01-12-2007, 03:40 PM
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Cmon guys, does 40rwhp sound reasonable? Fast 90/Professional products manifold and underdrive pulley.
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Old 01-12-2007, 03:44 PM
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avg 10 for the pulley and then look in the stickys for manifold, maybe around 30peak rwhp. tottaly a guess
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Old 01-12-2007, 04:04 PM
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Yeah that's I've been looking at, ~10rwhp for the pulley and ~30rwhp for the manifold. Can't believe that the stock ls1 manifold is that damn restrictive.
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Old 01-12-2007, 04:04 PM
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unlocked with your a4...?

i'd say you'll see 20-25 rwhp with a pulley and fast 90 setup...that's not a monster cam, ya know.
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Old 01-12-2007, 04:07 PM
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Yeah unlocked with the A4. Those manifolds make their power up top just like this cam does. It can't breathe!!!
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