As quoted from 88workcar's sig:
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E7s & Speed Density E cam cobra intake1.58 60ft 12.40 @ 108.18 NA
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As I stated before, I dont know the flow characteristics of either set of heads, but I would probably go with the e7's. Stock for stock, gt40p's any day. But stock gt40p's against "extensively" ported e7's, I would go with the e7's for the port work and the fact that you wont have to buy new headers. But again, since I dont know the flow numbers of either, I could be wrong.