Reply To: Aftermarket exhaust for 2011 GT250R May 28, 2025 at 9:00 AM #19643 ♠️ M77👑 Admin Topics: 40Replies: 3,033Country: UKBike Model: GT Lauerjäger wrote: Can you rip that pipe out when you cut that flange off? Quote The inner pipe inside is the real exhaust, the outerpipe is a welded 2nd layer (also acts as a shield) , it doesn’t affect power.