How is the Injen a COLD air intake? The residuals are low enough on the Stingers that it is likely that the car with be worth more than the residual at the end of the lease. You would never want to turn in a car that was worth more than the residual plus any buyout fees.
If you sell it they will want it back to stock as well. If you plan on keeping a car for 5 years or more leasing is almost never the wise decision. If you lease a car you should do so with the intent to hand it back it if the value is less than the residual or sell it if the value is more than the residual plus fees. If you keep it after the end of the lease then financing it originally would most likely have been your best option.
I cringe when I hear "4 year lease". I know the payment looks better but it isn't a better deal. With a 4 year lease you are 100% guaranteed that the car will be worth more than the residual at the end of it. To realize any of that money you have to sell it.
Owning a stinger.
