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Hx 40 questions

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Old 01-29-2018, 11:15 PM   #1
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Hx 40 questions

Does the hx 40 have a 4 exhaust outlet connection?
If so, would a 4 down pipe connect directly to it?
Can my stock hx 35 be modified to connect to a 4 down pipe so that I could avoid the 3 1/2 bottle neck of the hx 35 outlet? It seems like that would help lower my EGTs.
Thanks in advance for any help, Marv
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Old 01-30-2018, 08:09 AM   #2
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HX40 has a 4" flange stock. You can purchase a new wastegate housing for your HX35 to allow a true 4" connection, will be a couple hundred $ though.
FWIW, an HE351CW from 04.5-07 CR cummins also have a 4" connection along with a 60mm compressor. Need to have a operational wastegate as it has a 9cm turbine housing.
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Old 01-30-2018, 11:19 PM   #3
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Thanks for the reply gorms, I appreciate the info. I don’t know enough about turbos to know what you are trying to tell me. The HE351CW”s 60 mm compressor, how does that compare to the compressor on my hx 35? And so what you are telling me is the 9cm turbin housing is different than on mine? It sounds like I might be better off changing the housing on my hx35. Cheaper and easier.
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Old 02-02-2018, 11:34 PM   #4
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I figured you were looking for a little performance upgrade since you mentioned the HX40. HE351CW was factory installed in late 5.9 CR trucks, has a 60mm compressor wheel like certain HX40s. Will flow more air than the HX35, which is usually 56mm. The "tight" 9cm exhaust housing will spool quickly, but you will need the wastegate connected to control drive pressure.

I am biased to the 351 because they are cheap and fairly reliable.
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