I have had many dealings with leaking rads. I think you best bet is to get an aluminum aftermaket. I have one in my daytona (works great) and I got one for my brothers jeep. They are usally under $175 and you get the satifaction of knowing that 1. its new 2. Aluminum and 3. it wont go bad if you keep the coolent fresh as long as you own it. GL man. Besides an Indy deserves the best.........