Hey guys, when i'm acelerating from a stop at half throtle, i'm hearing a sound from the front end.
it happen when I start from the stop in very low rpm and again in the 3000-4000 rpm range

it sounds like ceramic parts bumping on thick sheet of metal or metal to metal I don`t know.

a friend of mine is prety sure that is one the three catalytic converter, what do you think of this?

also does the "y" pipe remove the two first O2 sensors?? or4 does it make your engine act wierd??

 

it doesn't take away any o2 sensors, it does take off the precats though

your pipe could be loose check all the bolts and make sure nothing is close to the pipe so it could rattle...