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If it was an 8.3 ISC he would not be asking for more power. Spent 6.5 years driving one, they are mountain masters. Just got my new to me 10.8L ISM, now I know what real power is. A real 2 spd jake brake, fun to listen to and works so well!
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01 6spd 2500 Pac brake, SOLD
2000 AF 1150
2005 Tiffin Zephyr, ISM, Tag
2007 GMC Dump...Truck 
2006 Charger SRT 8
2011 3500 DRW Longhorn
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