I found one that I was thinking about buying, but I don't know how big of an impact it makes on a sixbanger. Does anyone have one, or have any experience with one? Is it just "plug and play?" Does it set off the SES light or anything? Is it hard to use?

 

Can't chip a 4th gen[&:]
HPTuners if you're going that route.

 

The only "chip" for the 4th gens is a JET module. And all it does is modify your spark tables a bit... As for a "tuner chip." They don't make them for 4th gens as 98RCMARO said