[ilia]

You can try to sell it, or scrap it. I kept the original exhaust for my 335 and ended up giving it to the dealership, thinking they'll replace it, but they ended up scraping it. It wasn't worth the time to replace it. However, if you are leasing the car, I would think replacing the aftermarket exhaust with OEM would be required at turn in... But I'm definitely not a lease expert. Anyway, good luck with your decision.