These cars with a tune are a completely different animal. I'm so glad I decided to have a tune from Torrie at Unleashed Tune. I now drive with a huge smile on my face. The gain in power and the way the trans now shifts is unbelieveable in both regular and sport modes. This is the way the car should have come from the factory!!! My sport was built on 9/8 and has no options and NO battery problems.