Something is wrong. Check your exhaust gasket. One gasket should work and two gaskets will give you problems in the future. The unipod intake should be louder than the exhaust of the Technigas pipe and a biturbo is louder than the technigas. Did you use a new exhaust gasket when you put the pipe on? If not, that is your problem because the original gasket is stuck to the original pipe and is almost impossible to get off whole.