hey need help not for usre if this is how htis work i jsu bought a 94 prelude,, the guy put a cold air intake on it , and new manifold pipes that goes to a test pipe" i think that s what he said ", and thats it , its not connected to the rest of the exhuasst ,"mid car back" i guess, but has stok hanging in back still" fool tha law " dunno, but i had bought car for me n my son 10mnths, just need to keep it running, the chk engine light is on well, and he might have said it needs a 02 sensor, help me, thank you , , sincerly sean & denver