depending on you budget-you could get the 6T and plug the timing control into it as well - it's not a slick as the boost defined retard, but i had a knob on the dash and could adjust the timing 10 degrees either way. i launched with boost so the timing was pulled back all the time, but it did vary depending on the temp and how much alky was in the water injection. if i ever took the car out to go to work or something, i would just turn up the timing from in the car for better mileage and driveability off boost. i really liked having the driver adjusting knob on the car.