they actually Dyno each car to make sure its making proper power. Also my dad Just purchased a 2005.5 Audi S4 6spd about 4 months ago. It was a demo from the dealer with about 150-200 miles on it. Ever since he's had it, from the test drive to now (around 8k miles) he's redlined it (7Krpm) and driven it hard. So basiclly no break in at all and its running great. Not a hitch. He's even got highflow cats, downpipes off the headers, cat-back and intake on it.