Here I am

Wanted!!! 18.5 cm hot side

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93 w350 Club cab Dually, one owner

'04.5 ....4" downpipe (turbo to cat conv. pipe)

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Hmm didn't know there was such a beast. I believe the size is cast or stamped on the inside where it mates to the exhaust manifold. Check it out and if it is an 18. 5 I will take it. Just let me know.
 
I don't know of a 19. 5, just 18. 5 and 21 used OEM. However, the 16 is definitely the better choice. I have tried all of them up to 400 HP on the Dynojet and street.
 
Wouldn't say a 16 is a big improvement, but it is an improvement. A 14 would be better but they are harder to find. 91. 5-92 will have a 21 housing, 93 should have an 18. 5 housing. IIRC the non IC trucks had a 19 housing but a small compressor.

An 18. 5 is only slightly better than a 21 and not changing the compressor wheel doesn't gain much at lower pressures where it is needed. An HE351VE is a big upgrade but a lot more work.
 
I have a new in the box 14cm non wastegated housing that I will not be using and I will take $125.00 for it including shipping to anywhere in the USA. If interested just PM me.
 
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