It depends on what you have done to your car. I have had an E303 for the last four years and I am only replacing it now because I rebuilt the motor. The E303's power stops at 5500 rpm which is great if your car is stock or just has a few bolt ons. Are you racing? Do you need more than 5800rpm? Do you have gears in the rear end yet? Yes there are more powerful cams than the E303. I think the F and the X cams are street legal now. I know Crane Cams has some too that are bigger than the E303.
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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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