I assume these gains are each company's reported gains from the products, not reported from a dyno test of your actual Jeep? I'm asking because I've always wondered if you can simply add them up or if there's a net difference.I would recommend the CAI and a cat back muffler delete, I added the Mopar CAI first and it is a noticeable increase in torque/hp ~5-10 at 4000+ rpm and a deeper growl, then I added the Flowmaster Outlaw and that added another 5-10 hp. The engine is just a air pump and removing the restrictions will help, I would recommend it and it is worth the $$$.
Check the pics, both were easy installs, the CAI is 30 min without cutting the hood.
For example, if your combo nets 10-20 hp based on claimed gains (5-10 each). Do you lose some of the max gain after there was some other gain already made? Meaning you would get 7-17 instead of 10 to 20? Or as theory would suggest, one mod helps the other and you get more gains than stated. Meaning you would get 13-23 instead of 10 to 20?
I'd like to see someone with a JL actually test this stuff.
As for feeling it. It's going to be minor. I really think it's largely a placebo effect.
4336 lbs / 270 hp = 16.059 lbs/hp ← Stock (depending on options)
4336 lbs / 280 hp = 15.485 lbs/hp ← Assuming a cumulative gain of the claimed 5 hp values
4336 lbs / 290 hp = 14.951 lbs/hp ← Assuming a cumulative gain of the claimed 10 hp values
Those same ratios of 15.435 lbs/hp and 14.951 lb/hp equate to only 171 to 300 lbs of weight loss on the unmodified 270 hp engine (see math below).
270 hp x 14.951 lbs/hp = 4036 lbs
270 hp x 15.435 lbs/hp = 4167 lbs
How does it feel?
If both net 5 hp and the gains are cumulative? It's going to feel like you had an average adult female passenger exit the vehicle by adding both mods. (>20 years old 167-176 lbs).
If both net 10 hp and the gains are cumulative? It's going to feel like you had two average size 16 year old boys exit the vehicle by adding both mods. (103 to 185 averaging 144 lbs at 16 years old)
So adding an intake and exhaust feels like an average woman, or two teens got out of the Jeep? That doesn't seem like something you're really going to feel. Maybe some people are more sensitive to power gains/loss, but I'm skeptical.
I'm not calling anyone a liar. I'm just saying it may be in your head more than anything. It's a perceived gain, and as I said before if you perceive the gain, then why not do it. That is what you're after isn't it. Who cares if it really is faster or more powerful as long as it seems like it to you. My main point is to not have unrealistic expectations of what these minor mods can do for you and you'll be fine.