Okay here is my problem, I'm going to purchase a nitrious oxide kit for my limited, the person selling it tells me I will not need to tune my car just install it, fill the bottle, and away I am. But other people I've emailed tell me a tune is essential. I'm confused I dont want to pay someone $500-$600 to tune it if it doesnt need to be tuned. What are your thoughts??? any advise would be great!