Here in Chicago, I paid 36 dollars to get the 10 lb bottle I have filled up the first time. After that, I paid under 30 dollars per fill. There's always a stray pound or two of nitrous left at the bottom of the tank.
I fill my nitrous at the Car Boutique in Schaumburg on Roselle road. It's the only place as far as I know that fills nitrous bottles.
Also, stop making excuses for yourself. Buy the nitrous and use it. No exhaust in the world can give you that awesome pull that the nitrous gives you.
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