Originally Posted by Rough Country
You will want to go with the x-series kit. It will come with adj lower arms to fine tune the caster adj and a adj track bar. Much better setup than the entry level.
I'm glad you posted this. If the above is true and correct, then why should the OP not simply buy the entry level 4" kit based on the following statement from your website as to the base 4" product:
"Kit maintains stock alignment for precise high speed handling and proper caster/pinion alignment."
I would hope that RC would update the website content to be accurate and truthful, considering the naivety of many purchasers of your product, and the absurdity of that statement.