opinion Itr Vs apexi Ws muffler

[bvtec]

I would really like your opinion on this cus i really hate the Ws exhaust and i also feel alot of lack of power... when i ride in stock R that have the stock muffler it feels more flowing... Opinions pls if you are going to have neg comments, pls keep them to your self..
It would all so be nice if any one could fine a flow rateing on both?

Thanks