I have been looking for a replacement fan for the tower at faster speeds but the only fans I find are 25-30 , example 200x200x25 , 200x200x30 and the fans that come with the case are 200x200x20. Will I be able to fit the 25 or 30s in without having to mod the case or not? Looking for a high air flow fan to replace the ones I have above 80.