Bnr s4 stock block

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06 ms6 sport
Going to pick up a Bnr s4 but I want to know if I have build the block first. I see lots of people running the s3 on stock block is the s4 possible? I will be building my block but not anytime soon and I need to get rid of this smokey k04.
 
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2007 mazdaspeed 3 GT
I ran a PTE 5858 on my stock block from 124k to 162k. All in the condition of the motor, maintenance, and having a good tune
 

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