Try a magnaflow. My brother had one put on his range rover. the thing sounds sweet and mean now.

IT definately growls with authority.

I think he didn't spend much on it, like maybe $150 or so. Install also cost a bit, and tips were extra, but I think he spent around $300 for his setup.... included a lot of new pipe though in the underside of the car.

Alon

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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon - Sold
2006 E350 Wagon - 368 - Dead
2015 GL350 Bluetec - 197U