Remember,.. higher octane resists detonation better than lower. At the same psi larger turbos make a cooler charge than smaller stock ones - that also is helpful. Z1 EPROM? Well that's a variable right there, isn't it?
*how* did they tune it? What was it tuned *for*?
Specifically designed for your car, (dyno?) or off-the-shelf?
Injectors are HUGE, and mean everything when you try just crankin up the boost.
Swap out the injectors from something capable of handling high psi, we'll talk.
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