The S4 is a terrible SOLO car. My first year I ran in D Novice class and did fairly well (I ran as stock class). The next year I ran in D Street Prepared class (once they found out i was modded) and got slaughtered. Just a chip puts you in DSP because you are modifying boost.
The car is too heavy, rolls too much, and just generally does not handle well on small, tight tracks. The S is much more suited for road racing courses like Buttonwillow, or Willowsprings, or other tracks like that where you can actually get out of 2nd gear.
Basically it's not worth running in SOLO unless you either don't care about winning or you have a $h!tload of money to throw at it. Granted it IS fun.
There was an article about a year ago on Autoblog about a guy running his S4 (sunroof delete) in SOLO, but had an ungodly amount of money invested, basically the entire STASIS catalogue.
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