Margal

I have to replace my stock bumper soon and rather going to mtech single exhaust outlet I am thinking to get M5 dual outlet bumper just for look mostly. I have RPI exhaust now and like the sound and really want to keep it. But I do not want to put fake tips as it will be obvious as the smoke gonna come out from one side only. I am thinking to custom make some kind of this one Eisenmann Exhaust for the BMW 520i, 523i, 525i, 530i (E60) Sedan - 4x76mm round tips | Eisenmann Exhausts to RPI just to run the extension pipe to other side and connect it with T shape connector for easy removal. I am not sure if it will effect the sound or performance of RPI exhaust. Need your opinion before I spend money and time on this project.Has anyone done it here? And how much I should expect to pay to the shop to custom bend the pipe?Thanks