Just a side note for your power drop at 5400 RPM. When in factory trim power drops at 5250, so the intake is probably only good through 5500. I use to pull my RPM till the tach bounced with stock everything and the E-cam. I know the tach wasn't right. But remember that the E-303 peaks in power at 5500 rpm. One thing that would help for information sake is an autometer tach. I just thought I would offer up my opinion. Good luck with the new intake.
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Black 1990 LX DSS Racing Super Pro Bullit 331, AFR 185, Anderson B31 Cam, 1.6 DSS rockers, Cobra Intake w/ 2 phenolic spacer, Aluminum DS, 3.73 gears, Tremec 3550, Lakewood SFI Bellhousing, MSD Digital 6+, Spintech Side Exhaust,
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