Here goes: I email Walt these DTC's 18-35-54. He gets back to me same day with the diagnosis and the prescription. After receiving an IP and ECM I email Walt again with 3 installation questions. He answers with detailed instructions and lo and behold I'm...
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From: Ed S.

I just replaced both heads on my 1994 K2500 6.5 Turbo diesel. I bought and installed your cooling upgrades and D-Max fan. Wow this thing runs cooler than it ever did with the single stat. I really like the way the truck runs w/ your intake system. You can...
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From: Ed K.