Have you taken a look at the BurgerTuning.com juicebox? It's a piggyback device that costs a fraction of the price of the Dinan. I have it--it's such a noticeable difference in power. I've also had 4 Dinan products across 5-years and they certainly do work... but they cost 1000s and provide no more, or subjectively-speaking less, seat-of-the-pants feeling than the Burger juicebox. The numbers don't lie either--my M5 Dyno'd at 613 wheel-horsepower and 605 ft Ibs of torque with the juicebox. That's around 700hp at the crank if you use traditional drivetrain-loss percentages.I am considering doing the dinan upgrade. Has anyone done it yet? what package did you do? any diff? worth the money?
Please advice thanks advance
Nod, I understand that perspective... and I shared it for a while on my prior three 550s (an E60 with a Dinan tune and two F10 550Xis with Dinan stage 2 and 3 respectively). Not once did I use the warranty in 5-years; BMW took ownership of whatever minor issues I might have taken the car in for and never pointed a finger at Dinan. Of course, you could argue the peace of mind aspect, too, and that's a personal choice. Completing this thought track for me, though, is the fact that if I have any concerns over warranty and need to take the car in, I'll spend the 30 minutes necessary to remove the piggyback. Even with all the software I've got to read the car's faults, re-code it, etc., I can find no lingering data that would indicate it's been tweaked and both my SA and his lead tech tell me they see no lingering artifacts either (this is a topic of some contention, though).There are certainly competitors to Dinan that provide more power at a fraction of the price. But none have the Dinan warranty. Given how expensive these cars are, to me, that warranty makes Dinan worth it. Would hate to save a few thousand bucks on a tune only to have an engine or drivetrain failure costing tens of thousands of dollars, have BMW walk away from the damage claiming the tune did it and then have no real warranty to pay for the repairs.