MBRP 3.5" ID to 4" OD x 7" Universal Adapter UA2007
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AVAILABILITY:71 In Stock
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Now you can hook-up to your MBRP 4" and 5" hardware no matter what size your system. This adaptor is built from heavy duty aluminized steel. It has a 3.5 inch Inside Diameter expanding to a 4 inch Outside Diameter.