Re: new guy
Congrats & Welcome to the Forum!!!
The Limited XFire is more of a GT car rather than a high performance car. If speed is what you need then the SRT6 would be the way to go. The Limited is based on the old MB R170 (215 HP) platform, the SRT6 is built on the MB AMG (330 HP Supercharged) platform a totally different engine. There are no "off the shelf no bolt on performance' mods for the Limited other than an ECU chip upgrade and exhaust upgrade. There are companies out there that can do a performance upgrade like Brabus, Startech, RennTech but they are extremely expensive and run about $18K - $26K. At that price point the SRT6 is more cost effective, do a search, there are many threads on performance.