Original post by: skipwired ,
Egr tuner is the best $400 I ever spent. ROI within two weeks. Gained almost a full mpg according to IFTA quarterlies over the last year. Cured turbo cough immediately and completely; more power, and; oil stays nice and clean. Don't know why Kevin doesn't push this product by Jeff Justus. The other thing on eBay is on the right track, but is not adjustable for the times you do encounter altitude shifts.