My X-Pipe was $143 installed and is the best mod ever for a 4.4i! Such a great low tone, not redneck, but definitely pronounced. Even my dealer and service advisor loves the sound

No need to spend big bucks on the exhaust to get some satisfaction!
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2006 X5 4.4i Imola Red loaded up / Invision / X-Pipes
2006 M Roadster Sapphire Black w/333bhp. Nuff Said