It's actually quite a bit different than the APR (at first look it looks similar). The ECS gets rid of the entire stock airbox, and uses a combination of an aluminum heat shield and CF top plate in conjunction with a larger filter. APR reuses the bottom half of the stock airbox, so the filter is similar in size to stock. ECS also has a full provision for the breather assembly, and it looks like better quality materials. The CF intake tube on the APR system is paper thin.
The picture above doesn't do the system justice. Look at the pics on the ECS site or the install instructions to get the full picture. Having installed the APR and CTS systems on my car, I can assure you this is the most "engineered" system available; although I can't comment on performance without testing it firsthand.
Edit: I can add that from a performance standpoint, an intake with an open filter that gets rid of the stock airbox, and uses a heatshield, typically performs the best (both in terms of logging and 1/4 mile times). This ticks those boxes, and adds what appears to be a larger filter and CF top cover.
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