Compression Ignition Addict
Join Date: May 2008
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First off welcome to the forums, you came to the right place for information. Many of us have been in your situation before so there is a lot of information reguarding these products on here.
Of the two you stated spartan is a better choice, better fuel mileage gains, more power, better tuning on your truck, and you can still use dpf on tunes. Banks doesn't have dpf off tunes so it deffinetly limits you. Along with spartan there is a few other reputable companies like sct, and h&s
Deffinetly do some searching as you will quickly find out what you want to know.
08 f-350 cc/sb 4x4 dirty diesel, nadp