I just bought a new 2012 CTS V coupe and I am not familiar with all these new electronics (TC etc). If I want to make a couple of passes at a test and tune, will a 26" tall drag radial affect the car if I have the TC off and Stabilitrac off? Since the rear tires are 26.9"tall will there be a difference. The CTS V Coupe is a 2012, 6 speed manual and pure stock. I have some OZ modular wheels that are 17x10 that I wll try to fit otherwise I will have to get some 18's. I'm hoping the 26" tall drag radials will work to give a little lower overall gear ratio for 1/4 mile use. Any tips about launching will be appreciated. I am 66 years old and have been drag racing since the mid 60's (senior year 1964) and have only had manual shift cars, so power shifting is not my problem....I just want to know the proper method for launching one of these new cars. I currently have an SRT-10 Ram (stock engine, 6-speed, lightened somewhat, runs 11.63 @118) and a 2000 Firehawk that I am having the engine rebuilt at LME in Houston (433 cubic inch LS1 , darton wet sleeve block, ETP heads, Harrop Hurricane intake), so I will be keeping the CTS V stock.