A CAI is bad enough. but you installed a Hot air intake? Honestly i'd return it to stock. don't bother with no heat shields. you are trying to cool something down which shouldn't be hot to begin with.

 

Why would you even want that intake? Instead of pulling in the coldest possible air from the airstream hitting the car head-on (stock lexus intake pipe+airbox), you would be using hot air from the engine compartment instead. That will easily drop your performance by 7-15%. What benefit would that serve? There is no heat shield that would shield you from the heat of the compartment, as you would be pulling in hot air. That heat shield will not be able to cool that air, as it is not what it was designed to do. It just can't do this by its design. Its purpose is to simply isolate one component from heat soaking another, which is not the case here.

 

 

yes on the heat shield, also try the thermal reflective stuff of DEI to reflect radiant temps, a decent heat shield will show a decent temp change.

 

 

With turbo charge cars and the intercooler setup it runs, hot air pre cooler is not as important, the cooler effectiveness is what really matters as that is the air that get used. Yes, having as close to ambient air temp as possible is important but your overstating the importance when it comes to turbo charge cars that has an after cooler.

 

here is my setup, using rubber weather strip and insulation does make it effective in keeping away the heat and engine bay air, it also retains the cool air induction that the factory system uses.
I must admit, I did it more for thefsound then the performance gains itself, I wanted to hear the induction and actuator sound and did not want to hamper performance. The larger diameter piping did allow more air flow and smooth it out by removing the flex section.