I have that one waiting to go on. Has 3.25 ID and a silencer. High flow and quiet, best of both worlds.Thoughtful_One wrote:HKS Turbo-Spec Hi-Power.
One of the most free-flowing systems that money can buy aside.
Even though the piping and can are huge, the system is VERY quiet and sounds extremely aggressive.
Below 3000 and during partial throttle is very mild. WOT is very aggressive and loud, but not raspy whatsoever.
Turbo magazine did an article where it gained 25 WHP over stock.