Your car is a money pit, but at least it's a fun one. Custom forged hardware is one of those small upgrades that makes a massive difference in how the stance looks and feels on the road.
Prices rarely dip for parts unless you catch a vendor sale during major car shows or holiday weekends. Waiting for a discount can save you enough to cover your shipping or a new set of valve stems.
Remember that the 15-month intro window is a deadline, not free money. If you have a remaining balance after the 15 months, the card will start charging interest on whatever is left.