Riptide

I can't recall if the OP said the 2010 was paid off? Because if it was then you're still going to be faster than the 2011 GT for less money if you keep the paid for car and continue to mod that. You may have to get a built bottom end and increase the boost but in the end it probably beats taking it up the *** eating the depreciation on the 2010 and then getting into another loan on the 2011.

The blown 2010 should have more power throughout the curve than the 2011 and that includes before you up the boost after going forged.