I have a ShoShop Y-pipe and I am hearing some rattling when the car is running.. I am sure it is exhaust related cause the rattle changes when I rev or let off the gas. I have a smog check coming up soon so I need to get this squared away. I checked previously and it sounds like it is coming from drivers side of the car.. below the air filter area.. couldnt take a good look.. but will soon. Any ideas? If it is the cat is there a good aftermarket hiflow one to use?
Thanks CEG.
