DIY 6637 is the most bang for your buck, but an exhaust would be an even more significant improvement. A full 4" Turbo back will really open her up and allow for better turbo spool/more boost.
Then there is chips.... (Get Gauges FIRST!) They turn it in to a whole 'nother animal! (PHP has a 6-position chip with CUSTOM TUNES for $300!):crazy:
Depends on what you want. I wanted cheap and functional, So I went with Glowshift.
If you want made in the USA/Top of the line, Isspro or Autometers.
Lots of threads on here about them. I have the 3 in 1 Diesel Gauge, (1500* EGT sweep and digital boost/transmission temp) and 8+ months now no issues, love it. Paid $175 for the Gauges, sensors, and a painted A-pillar pod. :thumb:
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