as far as what I have seen in pics the R2C vs. Typhoon, the R2C's seem to turn down a bit toward where most of the air comes into the front of the car. The tubes look like they might be a bit longer... though I cannot say for sure.
The tubes do get heat soaked, but the open filters on an SRI like the 2 mentioned above also get heat soaked and are not getting a steady supply of colder outside air.
OP, the stock set-up is very efficient and most go with the Stillen G3's which is close to the same price of the R2C's, but more work to install and change/clean filters. Best bang for the buck is the drop ins and tubes... overall biggest amount of power is going to be the G3's.
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