[michiwop]

I am not a tuner expert, as you can see from the previous question I had. But, my understanding from reading articles, talking to other owners and reading posts is that the answer would be YES. Depending on the mod you do, your car may still run correctly, but to get the maximum performance from the mod's, you need to get updated tunes. In my search, I have found that most companies that sell tuners have updated tunes for a reasonable cost. You just tell them what you have and they send you their tune that they have found to be most effective. Your best bet would be to contact the company you bought the tuner from, and more than likely they will give you an updated tune for a fairly good price. Again, I don't have personal experience, but after sifting through a ton of posts and contacting sellers of the product, that's what they say.

Thanks NVR4GIT. I was hoping there would be enough functionality in the X-calibrator 2 to modify one of the tunes it comes with, but I should probably just contact Brenspeed with each upgrade.