I've sat in a couple of lowered Aurions and feel that I can make a comparative comment. When comparing a lowered Aurion with 19's/20's to a stock (Sportivo) Aurion with 17's, the ride comfort is noticeably different. It's not a massive change, but it's enough to notice it's slightly more 'twitchy'. That said, it doesn't take long at all for you to adjust to it and completely forget about it. As well, springs like Kings and Pedders are a more progressive spring than the stock springs. This means that for the initial bit of compression, they are rather soft. This means that even though they are lowered, it doesn't instantly mean the ride is hardened up for your everyday driving. Most of the change in feel comes from the larger wheels and lower profile tires. The difference in comfort observed from the springs alone isn't really that much when you are driving normally. As for the factory warranty, changing the springs will not affect it at all unless it can be proved that using lowered springs was the cause of any fault that occurs in the future. Thanks for the info. If I wanted to lower my aurion with 19s, what specifically would I ask for at pedders? Sorry I am pretty new to all this, have only had my aurion for 4 days :)