Stock Rods and Boost?

Gearbanger 101

Straight Outta Locash
20+ Year Stangneter :roc</strong><span class=
Aug 10, 2002
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Ontario, Canada
How much horsepower before the stock rods give up? Getting my PI headed Cougar ready for a 9psi AED and if I can get away with just upgrading the pistions and not the rods, I wont. I've been told between the 400-425fwhp range. Sound accurate?