Exhaust

[cstanek]

Originally Posted by cstanek

I'm also wondering this, only on a bigger scale. What modifications can be made without needing to update the custom tune? Or maybe an easier way to answer might be "what mods will require a new custom tune?" I don't want to get a custom tune only to have it end up being worthless down the road because I want to add another mod that's not compatible with that tune.

After reading a handful of posts on the first few pages of this forum, I think I've determined a simple way to answer my question would be like this:
- If the mod comes before the cats, a new tune is needed. This also includes high-flow cats.
- If the mod comes after the cats, a new tune is NOT needed.
Someone please tell me if I'm wrong.