Modified Bullet Catback: 1- Hinged on the throw (doesn't hit the differential or chassis) and doesn't harm if you're carrying or at factory stance. - 2- I modified the muffler by adding an extra bypass to the non-primary one for the back pressure issue, which is known with Bullet mufflers, the bypass is small. Now I can (step on it with the muffler closed normally) with no back pressure at all after the extra bypass. - 3- Note: I added a new modification, I installed a large silencing muffler after the small smoothing muffler so that when the sound is closed, it silences like the factory completely and there is no back pressure. - The catback is intact, no leaks, the muffler is intact, and the valve is intact. - The price is by offer, and the kit cost me a lot to reach this excellent result, and the reason for selling is to switch to an X-pipe. - Any offer below 2500 will not be considered. . . . . GMC Sierra Catback Bullet Max Power Max Power X Super Blurkit Blurkit Star Power JSPower MaxPower StarPower BlurKit Bullet Bolt Y-Pipe X-Pipe Silverado Sierra F150 Bullet Muffler Corsa Corsa Bullet Headers Long Headers Short Headers X-Force American Racing Kooks Catback BTM Xforce Borla Attack