This brand new catless bellmouth downpipe replace the stock restrictive catalytic converter in the Volvo C30 T5. With the straight-thru design this catless down pipe increases horsepower and torque with maximum exhaust flow and allows the turbo to spool up and build boost quicker. This downpipe is made of T-304 stainless steel and piping size is 3" 76mm all the way. There are TWO O2 sensor bungs welded on the downpipe. Package included all bolts and gaskets. The downpipe fits 08-11 VOLVO C30 T5 TURBO 2.5L only. Does NOT fit Non-Turbo C30.