Quote:
Originally Posted by Alex07M3
Just so you know, $8k(supercharger+test pipes) in mods on the S65 will give you ~500whp, I think that's some pretty good bang for the buck! And the sound it makes!! 
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I have gone down the supercharging an NA BMW route, I am a happy camper.
But going that route vs a tune, downpipes on an already factory boosted car is very different in terms of cost and complexity, especially if you are like me and do most of the work yourself.