Not Ranked
SPF and ERA have the designs down. So in the end it is up to how much you want to do. I really dont know how much more an identicle powertrain equipped ERA is relative to a Superformance. I am confident the quality control will be better on the ERA. So you may wait 6-8 months longer to get an ERA or you can sort your SPF out in the same time period.
If possible buy a lightly used one under 1K miles. No secrets, you can touch it, smell it, drive it, look at, not guess how it will turn out etc, what will and will not need chased out of it.
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