https://cnrautoparts.com/exhau....st-uppipe-for-for-6-
The stock radiator is one of the parts that should be replaced with an aftermarket 6.4 radiator. One of the more infamous problems on the 6.4 Powerstroke is its weak pistons that were prone to early cracking. A cracked piston allows extra air into the cylinder, which then decreases the compression ratio. AFe products are dyno tested with our in-house DynoJet, and our airflow products are also flow bench tested, for performance you can count on. Our engineers use state of the art technology to design
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