So if I can condense the past few pages (check my "math"): This header is specifically does the following:
- Can reduce/eliminate the torque dip without tuning or further modifications.
- Adds a little bit of rumble without significantly increasing the sound level of the exhaust.
It is a standalone part, minimizing the amount of work that needs to be done to eliminate the torque dip. If you're using this in combination with other mods, you may have to get a custom tune...as we've come to expect.
So it seems like a lot of the negative comments, specifically those centered around CEL codes, are coming from a misunderstanding of what this product is intended to do.