If it was tuned around the C&L MAF, I'd stick with that or you might end up running richer than you want.
I just don't see the great benefit of the C&L MAF. Seems its intent is to allow more air to which you have to tune around to compansate. A simple free flowing air filter is all that is needed.
As stated, you CAN tune around an oversized, more free flowing MAF, and without any aftermarket tune you are probably ok, but with a generic aftermarket tune, you'll likely be lean.