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Depends on your comfort level with the car being out of warranty. The reason people buy Dinan is the warranty as they are very conservative and most other tuners will make more power and cost less. However if something should go wrong your pretty much on your own. With dinan you get the piece of mind that the dealer has your back should your motor go kaboom. The issue is how much power do you want? Dinan claims 495 HP and 573lbs-ft torque but as always they have no dyno to back that up and those numbers are at the crank not at the wheels the way every other tuner does it. In reality your probably getting 60hp more and probably 90lbs torque more. Not bad but definitely less than most tuners will produce. Another issue is tunability after installing other components. Say you add intake and exhaust upgrades, with dinan they will not be fully utilized but with someone like Vishnu you can tune those factors in and maximize your bolt on's.
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