2003 Jetta exhaust upgrade , melts carpet inside?

I'm looking at upgrading my stock exhaust on a 2003 1.8t Volks Jetta. I took my car to a muffler shop and his supplier told him to be wary of removing the resonator aka muffler on under carriage because it basically dissapates the heat, and if I remove it I will likely melt the carpet. I want to upgrade to 2.5 " pipe from turbo back and remove the resonator, only having one muffler and not two. My work around is to try to mount a high flow muffler there and run pipes out the rest of the way, but still unsure if it will fit. Any advice, or proof of this happening or not with similar applications? I've tried seval forum searches and no luck on my own. Appreciate the help.