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Beware of where you order it. My friend called a dealership one time and asked for a price on S1, and somehow got quoted $700 dollars NOT INSTALLED! I thought he was BS'n me, but still dealerships do try to rape you on aftermarket parts, and since they KNOW your ordering it, they're more likely to try and pull the "voided warranty" act on you.
Modernperformance.com has it for 324 I believe, plus around $7 S&H. Regardless of where you get it, a dealership isnt the best place.
Stage 1 from Modern Performance was $333 shipped. Go here:http://www.mopar.com for more info on the contents as well as exactly what it will do for your SRT-4.
Roughly 3-4 weeks after you order it they will call you to let you know that it has arrived and that they have sent it out to you. It should be in your hands within a month.