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lol, of course the s4's are good to 400+whp. Made 461whp on my DET on 24psi on a 60 trim t3 Garrett turbo, .81 turbine housing on an ebay tubular manifold. That was before swapping out the stock intake manifold for a nice aftermarket and Q45 TB, lets just say pump gas 19-20psi felt like 24psi did on the stock manifold. The setup went on later to make around 540-550whp on 30psi. No sweat.
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