MBRP UNIVERSAL UNIVERSAL T-PIPE REPLACEMENT ELBOW KIT, 4" ID TO 5" OD - T409 - UTA001   THIS KIT IS BUILT FROM RUGGED T409 STAINLESS STEEL AND IS BACKED WITH OUR LIFETIME WARRANTY. FITS ALL FULL SIZED PICKUP BEDS IS IT TIME TO TAKE YOUR PICK UP TO THE NEXT LEVEL? CONVERT YOUR EXISTING 4" PERFORMANCE SYSTEM INTO 5" FROM THE "T" PIPE OUT. PERFECT FOR EXPANDING TO OUR 5" AUSSIE AND 6", 7" AND MASSIVE 8" MIRROR POLISHED STAINLESS STEEL ANGLE CUT STACKS.