I tuned program can be harmful to an engine if it is too aggressive, whether it's gas or diesel, hot or cold. The reason tuned diesels are "louder" is indicative of the advanced injection timing and is normal.
In most circumstances, I don't really do much for tuning in the portions of the maps that are below 120ºF. This way it allows the engine to warm up before really putting any power to it. There might be a little timing but that's usually about it.
Diesels are odd engines to understand completely. Gas is much simpler, except for the Air/Fuel Ratio bit.
Take care.
__________________
Bill Cohron - The Mad Doctor  
Power Hungry Performance - The ORIGINAL in Ford performance tuning... Since 1997!
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www.gopowerhungry.com - Home of the Hydra Chip, Minotaur Tuning Software, and the new Orion Reflash System for Navistar!
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