It's not just the tune, the internal parts just cannot handle that amount of force made by a certain increase in power output... it's not about pressure, it's about power output when it comes to pistons/rods.
I disagree too (along with kwhauck). My head gasket blew from too much boost, but here I am pushing the same amount of pressure. I put in a stronger gasket and ARP head studs this time. Now that it's reinforced, the worries have lifted. If you break something, you simply make it stronger. It's not going to keep one from modding.
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