Wow only 6 rwhp for a cold air kit? What's the diameter of the MAF housing on the aftermarket kits versus stock? I'm guessing they're the same if you don't have to tune for them. I would believe going to a larger diameter intact tract would help more but require a tune. I'm really impressed at the gains with headers. That's impressive. Great tests. I'm looking forward to the same testing when you get a 17 ZL1.
