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Gotcha, Are LS and EM1 top pieces the same? I have some headers but unsure which are which. I have a GSR LS and possibly an em1...
LS and EM1 aren't, part numbers are different. (P30 vs PR4)
GSR looks like it's using the same model number as the EM1 (according to accuraoemparts.com)
Mind getting me a pic of the GSR manifold?