Early 99 vs 99.5

[Liquidx203]

What are the signifucant differances between the early 99 and the 99.5-2003 motors? Are proformance parts just as accesable for them as the 99.5-2003? Quick responce would be great!! Thanks

[TurboSevenThree]

Late 99 - bigger turbo from early99 and therefore different y-pipe collector and pedistal

late 99 - 17* HPOP compared to weak-a$$ 15* pump on early 99

I THINK 01.5 (someone correct if I'm wrong) went from Forged steel connecting rods to Powdered Metal connecting Rods.

The injectors could be different too. I'm not 100% sure, my 2000 has AE's.

[Liquidx203]

Doesnt it have a completly different intake manifold?

[GM Duraturd]

Early:
120cc injectors
Bigger Turbo (not a typo)
15* HPOP

Late:
140cc injectors
Smaller turbo (not a typo)
17* HPOP

Other small difference which deal with other parts around these main ones. These are the main differences.

[TurboSevenThree]

Originally Posted by GM Duraturd

Early:
120cc injectors
Bigger Turbo (not a typo)
15* HPOP

Late:
140cc injectors
Smaller turbo (not a typo)
17* HPOP

Other small difference which deal with other parts around these main ones. These are the main differences.

say what? Did the early 99's not have the same turbo as OBS but intercooled....??

[Ryan Rønning]

Originally Posted by Liquidx203

Doesnt it have a completly different intake manifold?

Well the late 99's have a 3" holes instead of the 2" on the late 94 through early 99.

Originally Posted by TurboSevenThree

say what? Did the early 99's not have the same turbo as OBS but intercooled....??

No, it was a slightly different turbo without a waste gate!

[CloverLeafFarm]

here's the link
Differences between early99 and late99-03 trucks

[GM Duraturd]

Originally Posted by TurboSevenThree

say what? Did the early 99's not have the same turbo as OBS but intercooled....??

The OBS turbo housings are bigger than the SD turbo housings

[superduty4x4]

Originally Posted by GM Duraturd

The OBS turbo housings are bigger than the SD turbo housings

Early 99 does not use an OBS turbo housing. Same as the late model turbo housing, just smaller. OBS had a 1.15 A/R non-wastegated exhaust housing, SD exhaust housing is 0.84 A/R wastegated.

[BIGBLACK F250]

early 99 also has a wicked wheel doesnt it