MBRP UA1007 3 ½" ID. to 4"OD. Adapter T409
Product Description
UA1007
3 1/2" ID to 4" OD, 7" Length
Fits all pickup models
Now you can hook-up to your MBRP 4" and 5" hardware no matter what size your system. This adaptor is built from T409 stainless steel.