T3 or T4? how do you tell

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brianjbeach85

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Mar 10, 2011
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Trying to put this to rest! i have been wondering for a LONG time what the hell is a T4 flange? i know it has to do with the exhaust manifold and opening that bolts turbo to it.. but if i have a 12v 1996 cummins with the "school bus" style manifold WHAT flange do i have??? reason being trying to find a suitable 66mm turbo.. and i need to know what flange i have i guess.

thinking S366.. says T4 flange so yay or nay?:charger:
 
should be a T3. the t4 is just a bigger flange. if u set the two aside each other u will know the difference.
 
Get a t3 to t4 adapter for the s366 and an external gate will save you $$ over a t3 wastegated housing.
 
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