Got mine from oregon performance transmission parts through eBay for $17 shipped. I was pleased with the transaction. The only issue with the tune is if you have a tune with greatly increased line pressure for the 1-2 shift. The new servo pistons will make the 1-2 pretty stout. If your tune is mild or OEM, it will make a difference but won't be harsh. When I got my tune, they knew I was putting the Vette pistons in so they increased the pressure above stock accordingly.