Yes as noted above this is a dynamic increase in power and yes due to the way internal combustion works for relatively simple bolt on airflow mods a 10+% increase in power for a thermally limited product that is the IC engine is in fact significant.
You realise this reading about the R8 V8 engine mod pages. Usually a lot of money or rework is needed to get N/A performance increases.
I know the N55 is turbocharged and still thought the gains worthwhile, to me, without over- stressing the engine via a tune.
My current car is stage one and it's great, a new lease of life. But I 1) don't particularly think the OG M2 needs more power for road use/enjoyability, even if the chassis can take it and 2) have read the N55 is near at its natural limit as supplied and tuned by BMW, last thing I want to do is fry an engine with an 'M' moniker on it and deal with associated costs.
I'm glad this has sparked debate as that was the intended purpose.
