S5 vs s4 irons
#4
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the center S5 iron adds the air injection port under the intake ports, and deletes the EGR
the rear S5 iron looses a bolt for the top mount starter to clear the intake. water temp sensor changes threads
#5
Thank you and sorry for all the dumb questions but what is the top mount starter? also, won't the different threads for the water temp sensor matter? how will my s4 sensor work if the treads are different? again thank you for all the input this is my first time rebuilding.
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