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04-08-2013, 10:05 PM #1
03 Silverado Stock Manifold Question
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.
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.
(I don't want to spend a lot on them but if i need to then I will.)Corey M (CoDaChrome™)
the vehicles I have/had
1989 GMC 2500 4wd (Sold)
1989 Palomino hard-side popup
1990 GMC 2500 pickup 2wd
1993 Jeep Grand Cherokee Limited (Beater) (sold)
1997 GMC jimmy sle 4wd (Sold)
1999 Silverado Z71 offroad
2000 Sunline 30' travel trailer
2003 Silverado Z71 offroad
2006 Yamaha wolverine 450 4wd
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