Yeah but how would the IAT sensor be able to calculate if the TB was wide open no tube or filter? I think that would be a up in the air situation.Stock the r/t dyons at 330 hp 354 ft/lb torque, with 93 tune and 93 octuane fuel with 0kr and a catch can, it dynos at 340 hp and 373 ft/lb torque.
So the real question then is how much does the K&N CAI add?
The only real way to konw is take your car to a dyno with a full tank of 93, have them custome tune it fully optimized to establish the base line, then add the cai, then re-optimize it.
CAI + Dyno Time = ~$800-$1,000 and maybe +0-6hp
I read somewhere a guy took a billfold full of $100.00 bills (figurativly speaking) to a dyno shop and did the testing. He found that stock intake vs wide open throttle body / 0 intake / 0 filter / 0 restriction = +7hp so the conclusion was if you could fit an intake with 0 restriction the max that can be freed up is 7hp, and therefore ANY intake / filter that has any restriction will result in less hp.
I have also seen a place where they spent a day putting different intakes on a 5.7L Charger, and got from -2hp to about +5, most 0 hp gains.
What the cai manufactures do is do mutiple dyno runs stock and with their intake. The final results that are posted is the worst run they go stock, and the best run they got with the cai, then the comparrison is huge.
There may be some cars that see +10 - +20hp gains with highly restrictive intakes, or forced induction, etc. but for our cars you arent going to see that much.
When speaking with DiabloSport in person they said once Dodge updated the 5.7L to make 372 hp (remember this LX platform was on the 300 and Charger first making 340hp) they changed the intake and the new intake for the 372 hp engine isnt restrictive enouhg to need hardly any tweaks to the a/f ratio for the CAI, where as the 340 hp one really needed it.
The 2005-2009 Mustang GT platform would throw a check engine light with a cai, thats because its stock intake was restrictive enough it needed custome tuning. Thats how they got hp gains for 2010, stock CAI and tune.
If you want to see hp gains DiabloSport tune, headers, cat back, then cai. In that order for hp / torque gains. True headers are a jiant pain to install and cai is easy, but power gians arent there with the intake swap.
Some have gone with the drop in filter swap because the typical intake is open to the engine heat and is really a HOT air intake, and the stock system isnt that poor and tries to get fresh air, so a high flowing filter in the stock intake could be as good or better than most after market intake systems.
Both Mopar and K&N make high flow drop in filters.