Based on my very own personal Experience i trully thinks the HKS Hi Power is the best to go, I have it in my MSP for like 4 years now with Custom 3 inch Exhaust and i can tell you is one if not the best Muffler ive ever seen, heard or tried. The sound is gorgeous at regular driving, under WOT and boost is just extremely sick how it sounds. Being more expensive doesnt mean is better, HKS High Power with 3 Inch Piping and 6 TIP if not mistaken is the way to go...
hm that may be true but since im looking into the MS3 specific exhaust i dont know if its the same. thanks for the input though i am really considering the hks