Originally Posted by keepittrill
But isn't that expensive as hell? It takes under a grand to really boost the power in a 335i, how much is this kit?
Yes, but strictly speaking once you change the conversation of stock unmodded vehicle performance to what you can do once modded everything you do is applicable, in terms of performance. With that logic the I6 in the 335i is pretty much limited to simple chip tuning whereas the V8 doesn't even have forced induction, and is more powerful stock. And if you can spend the money to buy an M3, $10k is really just a drop in the bucket.
That said, my point is that these two cars really aren't comparable because of what they cost and what you can do with them.