I'm hardly an expert on diesels, but it sounds like you're "piggybacking" tunes? That won't work. Any PHP tune is built off the stock tune in your truck and won't play nice with someone else's tune. And, if you're NOT piggybacking, but are comparing the PHP tune to some other tune, I would not expect to "feel" a huge difference. But, you can be assured the PHP tune is safe for your truck and is probably getting the best out of it without putting some component under stress.
- Jack
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2014 F150 Platinum SCrew 3.5L EcoBoost 4x4 with SCT programmer
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