Well, it does say "depends on fuel quality" so I guess when running proper petrol, even 95RON this isnt necessary
I recently change my IC with Injen intercooler. The IC is used and bought from my friend. We did leak test and no issue with leak and no issue with fitment.So drove the car a bit and got an idea of the IAT2 after the intercooler installation.
The temps are definitely lower than stock, but that is rather expected. Ambient temps during this time of the year are around 32 celcius / 89F. In low speeds and traffic, IAT2 is usually lower than IAT by 2 to 3 celcius / 35F, while on stock IC the IAT2 was identical to IAT. The intercooler doesnt heatsoak as quickly as stock and I have seen differences in heavy traffic between IAT and IAT2 up to 7 Celcius / 44F.
But I did test also under extreme heat. Ambient temp was at 100F. First test was on the highway.I drove quickly anywhere from 90 mph up to 140. Like, getting to 130, dropping to 90, then back to 80mph and then up to 140 again and keeping that speed for 20 or so seconds. Run like that for about 10 minutes. The IAT2 unfortunately was sky high, much like stock. It went up to 118F maybe more, I need to check the datalogs. To be honest I havent pushed as hard in such heat on the stock intercooler BUT IAT2 was HIGHER than IAT much like when you are on the stock intercooler. I didnt know what to expect, I guess I believed that under heavy pressure IAT2 would not surpass IAT with an aftermarket intercooler.
I also did pulls from 2nd to 4th gears, 25mph to 105mph. Again, IAT2 was higher than IAT by 2 or 3 celcius / 37F. On the stock IC, IAT2 would be much higher but still I expected better. Maybe the ambient temps were too extreme for the intercooler to handle anyway.
On the clearly positive side, I do think the intake noise increased and got a sportier tone which is obviously placebo but still feels good to hear! When temps drop I do hope for better performance in comparison to the stock IC.