Heres what the paperwork from the shop that did the work says...1&3/4in QTP stianless headers 3" merge collector lt's no AIR/EGR QTP ORY (I was mistaken). All the clamps on the system past the headers say 4" on them. Also LS1 Billet core custom grind camshaft, HD dual spring kit titanium seals/seats/retainers. PSI Chromeoly 7.400" pushrods, and some more stuff relating to the 6.0 swap...
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