evil energy 2.5" butt joint stainless steel exhaust sleeve clamp band evil energy "evilenergy is our brand,we're a direct and professional manufaturer in china,one of greatest manufacturer and exporter in tuning parts include intake system,exhaust system,engine system,cooling system,interior&exterior parts. accept customized order with minimum quantity." butt-joint clamps are also a good choice when cosmetic appearance is important. this type of clamp is for connecting two pipes that have the same outside diameter. this clamp comes disassembled and conforms to the pipe upon installation. reaction block and forced bar for complete inner circle seal. this type of clamp does require that the sections being clamped have sufficient lengths of straight pipe leading into it.