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Can you install a Holset HX40 turbo on a 91.5 Cummins, is so, are there any modifications required? This turbo has a 17cm housing - I have read many threads about 16's and 18's, just never came across anything about a 17cm. I do have a 4" exhaust system installed on my truck. Any sense, from practical experience, anyone can provide on reliability, economy, and performance is appreciated. Thank you!
 

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If it has a 6 or 8 blade intake wheel. Walk away from it.

If it has a 7 blade intake wheel grab it. I don't think a 17cm housing was made. The 16's are a T3 foot print. The 18cm are a T4. You would need a T3 to T4 adapter if that is an 18cm.

Airflow has the 4" exhaust flange for the HX40's.
 
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