Owning a performance car is about more than just the sticker price. You have the oil changes, the tires, and the constant urge to make it sound better. A good exhaust wakes the car up, but it usually costs over a thousand bucks once you factor in the shop time. It is a big hit to take all at once just for a better growl.
We want to time this right. Prices usually dip in late winter when shops are looking to fill their bays before track season. Negotiate the bundle price for the parts and labor first. Once you have a firm number, we can look at how to spread that $1,100 cost over a year and a half.
Keep in mind that the 0% rate is a deadline, not a gift. If you still have a balance after those 18 months, the standard interest rate kicks in and makes that exhaust much more expensive than you planned.