I removed my cat/resonator... i went to go get some pipes....now ...the question is...should i plus/play the pipes from the down pipes to the muffler with some clams or should i weld them ? i bought somethings i dont know what they are called but they are about 4 inches big, you put half of one side of the pipe and the other half on the other side and then u clam them together...like a 'tunnel' sorta thing... now my question is...will i have drawbacks with this system over welding ? noise ? leaks ? etc ?