I don't necessarily have a limit on my car (using COS and LS1 PCM). Just thinking about another project car using the newer ECM's. I have done some reading on the LS3 MAF sensor and with the blade type setup some guys are putting them into different larger tubes. I know this is "not correct" but from a performance stand point, "might" be useful if one were trying to keep a MAF into boosted land.

I did start to open up a few more tunes and noticed what you mean by the earlier limits of 512 Grams/sec. Is there a patch to "extend the range" on these ECM's?