{"product_id":"stainless-bros-2-50in-diameter-1-5d-3-75in-clr-90-degree-bend-leg-mandrel-bend","title":"Stainless Bros 2.50in Diameter 1.5D \/ 3.75in CLR 90 Degree Bend Leg Mandrel Bend","description":"\u003cp\u003eThe Stainless Bros 2.50in Diameter 1.5D \/ 3.75in CLR 90 Degree Bend Leg Mandrel Bend (part number 601-06356-4150) is a high-quality 90-degree turn section for 2.5-inch custom exhaust and turbo piping builds. Formed from 16-gauge 304 stainless steel using a precision mandrel-bending process, this component delivers a perfectly round cross-section through the full 90-degree arc. The 1.5D loose radius provides a gradual sweep at 3.75in CLR, resulting in lower flow restriction and reduced turbulence compared to tighter 1D bends at this diameter.\u003c\/p\u003e\n\n\u003ch4\u003eFeatures and Benefits\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e16-gauge (0.065in wall) 304 stainless steel withstands exhaust heat and resists rust in all climates\u003c\/li\u003e\n\u003cli\u003eMandrel-bent bore stays perfectly round through the 90-degree sweep, eliminating flow restrictions\u003c\/li\u003e\n\u003cli\u003e1.5D loose radius (3.75in CLR) minimizes backpressure on 2.5in exhaust and intake systems\u003c\/li\u003e\n\u003cli\u003eStraight leg on each end provides material for trimming to exact fitment requirements\u003c\/li\u003e\n\u003cli\u003ePolished exterior finish makes alignment and weld prep straightforward\u003c\/li\u003e\n\u003cli\u003eCompatible with standard 2.5in exhaust couplers, clamps, and V-band flanges\u003c\/li\u003e\n\u003cli\u003eConsistent wall thickness supports reliable TIG and MIG welds without burn-through\u003c\/li\u003e\n\u003cli\u003eIdeal for downpipe bends, cat-back routing, and intercooler charge piping at the 2.5in diameter\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e601-06356-4150\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eStainless Bros\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003e304 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWall Thickness\u003c\/td\u003e\n\u003ctd\u003e16 gauge \/ 0.065in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube OD\u003c\/td\u003e\n\u003ctd\u003e2.50in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBend Radius\u003c\/td\u003e\n\u003ctd\u003e1.5D \/ 3.75in CLR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBend Angle\u003c\/td\u003e\n\u003ctd\u003e90 Degree\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinish\u003c\/td\u003e\n\u003ctd\u003ePolished OD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003eStainless Bros limited warranty\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch4\u003eWhat's Included\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e1 x Stainless Bros 2.5in 90-degree 1.5D mandrel bend (part 601-06356-4150)\u003c\/li\u003e\n\u003cli\u003eStraight leg sections on each end for trimming\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eFrequently Asked Questions\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the tube OD for the 601-06356-4150?\u003c\/strong\u003e\u003cbr\u003e\nThe outside diameter is 2.50 inches. Use 2.5in couplers, clamps, or flanges rated for 2.5in OD tubing when mating to other components.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between 1D and 1.5D radius at 2.5in diameter?\u003c\/strong\u003e\u003cbr\u003e\nA 1D radius gives a centerline radius equal to the diameter (2.5in CLR), producing a tight bend that can increase backpressure. The 1.5D radius in this bend gives a 3.75in CLR, creating a wider arc that preserves exhaust velocity better in high-flow applications.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs the 601-06356-4150 suitable for a 2.5in turboback exhaust build?\u003c\/strong\u003e\u003cbr\u003e\nYes. The 2.5in OD with 1.5D radius is a common specification for turboback and cat-back exhaust systems on four-cylinder turbocharged vehicles. The smooth bore maximizes flow and the stainless construction handles sustained exhaust temperatures.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan I cut the leg sections shorter?\u003c\/strong\u003e\u003cbr\u003e\nYes. The straight legs are provided for trimming. Use a tubing cutter or angle grinder with a cutoff disc to cut to the required length. Deburr all cut ends before welding to prevent flow obstructions.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat filler rod is recommended for welding this to mild steel pipe?\u003c\/strong\u003e\u003cbr\u003e\nER309L is the standard choice for welding 304 stainless to mild steel. For stainless-to-stainless joints, use ER308L. Both require argon or argon\/helium shielding gas for clean, porosity-free welds.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat is the wall thickness of this Stainless Bros bend?\u003c\/strong\u003e\u003cbr\u003e\nThe wall is 16 gauge \/ 0.065 inches, consistent throughout the straight legs and the curved section. This provides sufficient rigidity for unsupported mounting points while keeping weight manageable.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDoes this mandrel bend require any straightening or correction out of the box?\u003c\/strong\u003e\u003cbr\u003e\nNo. Stainless Bros mandrel bends are produced to consistent dimensional tolerances and ship ready to cut and weld. The 90-degree angle and leg dimensions are verified during manufacturing.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs this the same as the 601-06356-4100 part number?\u003c\/strong\u003e\u003cbr\u003e\nNo. The 601-06356-4100 is a 1D tight-radius version of this bend (2.5in CLR), while the 601-06356-4150 is the 1.5D loose-radius version (3.75in CLR). The 1.5D version provides better flow characteristics in most exhaust applications.\u003c\/p\u003e\n\n\u003ch4\u003eInstallation Instructions\u003c\/h4\u003e\n\u003col\u003e\n\u003cli\u003ePlan the routing of the 2.5in exhaust or piping system and confirm the 90-degree bend angle and leg lengths required before cutting.\u003c\/li\u003e\n\u003cli\u003eDry-fit the 601-06356-4150 in the system to verify alignment and clearance with surrounding components.\u003c\/li\u003e\n\u003cli\u003eMark the cut lines on the leg sections and trim to length using a tubing cutter or cutoff wheel.\u003c\/li\u003e\n\u003cli\u003eDeburr all cut ends to remove sharp edges and facilitate weld prep.\u003c\/li\u003e\n\u003cli\u003eClean weld areas with acetone prior to welding.\u003c\/li\u003e\n\u003cli\u003eTack-weld in position before completing full circumferential welds.\u003c\/li\u003e\n\u003cli\u003eInspect welds and verify no leaks or cracks before installation on the vehicle.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Stainless Bros","offers":[{"title":"Default Title","offer_id":40482990489679,"sku":"STB601-06356-4150","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/Screenshot2024-07-02at1.57.14PM.png?v=1719943038","url":"https:\/\/www.blackopsautoworks.com\/products\/stainless-bros-2-50in-diameter-1-5d-3-75in-clr-90-degree-bend-leg-mandrel-bend","provider":"Black Ops Auto Works","version":"1.0","type":"link"}