It's pretty normal to use after market parts that are not OEM to improver performance, especially in the suspension components. Car makers have as much vested into keeping their cost to their subcontractors down and making lower quality parts then after market is pretty standard operating procedure in many areas. They then charge you outrageous prices for their OEM parts giving you the illusion they are better.
This may be true in a few cases but with a little research, you can often do better for less. Suspension components, wipers, tires, sound system, wheel rims, even brake pads and some ignition components...and the list goes on. Body parts especially to improve rust prevention are another area.
One of the most helpful resources to me in replacement parts has been parts people at the dealer. Get on a first name basis with some ( one was a relative) and they can save you lots of money with their referrals.