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Intakes can product extra power, but it isn't usually noticeable by itself. Anytime you help the engine breathe more/better then you are going to produce more power. If you have the mod bug then I suggest doing your research and contacting vendors and members regarding their mods to see what YOU like the most.
I personally had a custom exhaust system and F-sport intake and ended up switching to the PPE exhaust system, PPE headers, and PPE cold air intake. The entire setup is phenomenal and have yet to find something I would rather have.
Where did you find the PPE cold air intake? I can't find it anywhere
The 3is and 4gs Intake *PIPE* only will fit the 2is without any sort of problems.
IS250s have to have their engine cover modified slightly on the spongey side but IS350s have it directly fitted on with a SLIGHT raise to the engine cover. If you want you can use the new 4gs or 3is engine cover as those will fit directly onto the 2GR-FSE.
I will share my experience as of late. I put the K&N full system intake on my 11 IS250. Noticeable decrease in power, but there was a definite difference in sound. I have since replaced the K&N with my factory intake, and I am pleased with the performance as is. The only other thing I have done is add exhaust, which I love actually.