03 Silverado Stock Manifold Question

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by CoDaChrome, Apr 8, 2013.

  1. CoDaChrome

    CoDaChrome Rockstar 100 Posts

    I have been shopping around looking at buying some headers for me 03 Silverado 5.3 and really would like to know the stock manifold inlet size before I spend a lot on headers.:neutral:
    I see headers come in 1.1/2 and 1.5/8 inlet sizes and would like to know if changing to either of these would give much of a gain in air flow?
    I already have 2.1/2 from the manifolds back tru duals and next I am planing turbos or supercharger so if anyone knows of good ones of either of those let me know plz.:money:
    (I don't want to spend a lot on them but if i need to then I will.)

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