Race Car V4.0 - Ground up

[rherold9]

I'm still confused. Why are Non M parts in the equation? 

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Edit: Below assumption is wrong.... Wait nvm, I was right?

DJ thought the his previous wrecked e46 (325i that was converted to M3 motor) race car had 325i front arms since the rears were 325i. In reality his fronts were actually from an M3.

So he was swapping over his previous racekor parts and they didn't fit as expected because he bought stuff for 325i front end. 

And then this is what doesn't make sense???

And AKGs non-M control arms fit M3 spindles not Non-M