Insurance companies (well at least mine - Allstate) informed me that since I have a back seat (2+2) it can hold more people (4) so I'm being charged at a higher rate for full coverage than I would with a say Stage 6 Twin-Turbo! I was amazed at that... simply because there are more people (kids) involved so it would be more people to be covered than only 2 with a TT. Good luck.
P.S. Allstate is good if you have a clean driving record.
"Driving is getting from point A to point B but it's the experience and fun times that we treasure the most."