The HKS Hi Power Silent Exhaust for the Nissan R32 Skyline GT-R is made from 309 stainless, and comes with 95mm piping. This exhaust is made specifically to be quiet without a reduction in performance. Coming in with a decibel level only 3 decibels higher than stock.
The exhaust is made to work as a direct bolt on piece for your R32 Skyline. No further modification is required for this exhaust.
The item is a special order item from Japan. Please allow 4-8 weeks for shipping to receive. This is not held local by HKS USA.