If the intake is adding additional air
Which is one of my main bitches about these threads. Unless you add a turbocharge or supercharger no aftermarket intake for a TJ from anyone is going to "add additional air". That's because the air intake only flows as much air as the engine is pulling, the air intake can't add more air than the engine is pulling/demanding from it.
And with the TJ's non-restrictive air intake it's not going to happen. For those who refuse to believe it's non-restrictive, get on Facebook and find Jim Repp and ask him directly. Jim just retired from Jeep and is down in Key West Florida with his wife having the time of his life now. He was Jeep's Chief Engineer and dated from back in the CJ days. Jim is also widely known as the "Father of the Jeep Rubicon", it was his idea and he brought it to reality after convincing Jeep's bean counters to approve it. It of course turned out to be one of Jeep's most spectacular products.
He and I had lots of phone conversations starting around 2000 over a problem I was having with my previous 97 TJ that he found mentioned on the forums. Jim was also "leaking" information to me about the not-yet released Rubicon to keep the rumors down, like the air locker from Japan they were going to use. He contacted me because they were trying to find what was causing the problem, lots of '43' DTC codes and he was sending me boxes of parts to install to see if any helped. That problem turned out to be caused by a bad batch of valve springs.
Anyway, the age old issue of air intakes was alive and well even then and I asked Jim about our air intakes during one of our conversations. Basically I asked him if they restricted air in any way and he chuckled about it, saying he specifically told his staff to make it totally non-restrictive. Furthermore, as I have said here countless times, Jim said our stock factory air intake easily flows more air than the 4.0 can possibly try to pull at even WOT and redline rpms. No aftermarket air intake could possibly flow more air than the OE since it's not restricting airflow in the least... again it can easily flow more air than the engine is capable of consuming or asking for.
For those who continue to not believe what I've been saying for years about the OE air intake system and vehemently continue to disagree, here's Jim's Facebook page. Friend him and ask him yourself. Just don't be an asshole there if he replies back.
P.S. Some air intakes are restrictive. Two examples, the Camaro Z-28 and the Mustang 5.0 both have purposely restrictive air intakes. Replace them with an aftermarket no-restrictive air intake and the performance gains will be dramatic. Just not the TJ's.