Each shell gives the car a different feel and makes the car react differently. Last week I raced at West London and tried different shells back to back. The LTC-R should have been better because it's meant to give more steering and be a faster shell, but it makes the car very twitchy and nervious. I changed shells to a Mazda Speed 6 and the car became so much easier to drive and gave me more confidence to push it harder that I was lapping half a second a lap quicker.