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i have a LQ4 with ls3 heads what intake manifold should I use for the most power?
Stock LS3 unless you want to spend $1,000 for a FAST.
Where do you want the powerband? The stock LS3 makes good low end and pulls to about 6800. I make about 450rwhp on SBE LQ4, milled L92's, cam, LS3 intake and a NW 92 TB.