Dinan Elite Tuner. Ran this tuner for about 6 months prior to trading in the car. Did trigger the check engine light occasionally, but well worth the performance difference! These tuners were selling for $1,000 originally, and Dinan has since replaced them with what seems to be a lesser performing model. Includes the bypass plug to avoid having to remove all the wiring. Asking $250 obo.
https://www.dinancars.com/products/discontinued_product/parts/D440-0052
More Power (B38): Max gains of up to +40 HP and +50 lb-ft TRQ (Crank)
More Power (B48): Max gains of up to +50 HP and +75 lb-ft TRQ (Crank)
Smooth and predictable power delivery
On board diagnostics and factory safegaurds maintained
Unaffected by dealer factory updates
Plug and play installation
Quickly enabled and disabled via physical bypass plug