I purchased this product, for my 2002 Honda Accord 2.3 (ULEV). I was looking for a little more out of my 4cyl, and this was the answer. Installation took about an hour, and it is highly recommended to purchase new Body/Splash Guard retainers BEFORE the installation begins (as the clips are old, plastic, and frail... making it damn near impossible to reuse them).
After the instal, came the test ride (after letting the engine warm-up for about 10min). The moment I stepped on the throttle/gas, the difference in power/acceleration was obvious. The pick-up was 3x better, and the exhaust note changed slightly (I am still using the stock exhaust), not to mention how much more fun it was to drive when the V-Tech kicks in.
As a precaution, I also bought the AEM 1-4000 Air Filter Wrap... as the air filter sits approximately 6-10in behind the Fog-Light receptacle on the bumper. This will help prevent water from entering the filter, and acts as a Primary filter for any type of dirt/road debris.
I chose AEM for their product reputation, and I am so glad that I did.