Yeh as Dave said 18psi is no problem at all. And yes your STi has cast pistons. It'll last but when you mod anything you take that risk, I certainly wouldn't be giving it a flogging on a 40 degree day.
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365hp and 515nm
New Beast to arrive April 2015 - 365hp, 450nm, 0-100 in 4.4sec. AMG Goodness!
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