Just checked on another forum about the LOD display on the scangauge. This is the load on the engine and 99 is the max load so sounds like you where pushing it a bit.
Also check for obstructions in the intake or your filter as high restriction can also affect this value(according to other web sources). With the new exhaust did you change your driving style? are you pushing the engine harder now?
EDIT: I had not used the LOD feature before so I just gave it a try. Seems quite useful as it shows the % of power being used in that gear/rpm range. It can start quite high when the revs are low (30% at idle) then goes higher with revs when taking off and then drops as the revs increase (all in the same gear).
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