I don't think you'll come across any for BELOW MSRP, that's wouldn't make any sense.
As for the "extra change", I can add about 140 rwhp tp that car for you for about $1500.
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Sal Mennella
CSX 4241, KMP 357 - sold and missed, CSX 4819 - cancelled, FFR 5132 - sold
See my car at CSXinfo.net here >> CSX 4241