For the record, according to the testing of brand labeled pod filters the results are as follows:
1. Apexi = Very good
2. K&N = Good
3. Blitz = Poor
4. HKS = Very Poor
Now this rating is filtration wise, and as for performance wise i remember all of the pods were the rated the same and Apexi making 1hp more than the others. But IMO pod filters won't make much of a performance increase but probably will filtrate better than the stock ones and will also give the cool induction sound