It will still be an NA as long as you don't tell the insurance company. My car is 178/month with lowest coverage possible *still a stock vert , I'm almost 20 and thats under my own plan. My mods are about as simple as you can get, I have my car set to 10psi and it fully boosts by 3600-3700ish but pulls very hard. You really DO NOT need a turbo rear end and halfshafts if you don't want 300hp+. A 99' miata lsd would be nice and mazdatrix.com sells a "turbo transmission to non-turbo rear end" driveshaft.