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Old 07-13-2008, 07:12 AM   #2 (permalink)
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Join Date: Jan 2008
Location: Mirabel, QC
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The Guzzler - '08 Hyundai Elantra GL
90 day: 33.12 mpg (US)

Got Soul? - '11 Kia Soul 2U
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A diffuser will get you nowhere near a boat tail will. Moreover, a diffuser without a belly pan is not as effective. On the other hand, a diffuser is not really an involved job to do and install and can cost next to nothing. I made one out of coroplast for the Elantra that coverred everything but a 4 inch hole for the exhaust pipe, but I lacked a belly pan so it was not all that effective.
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