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hi i just baught my isf couple months ago it came with sikky headers and hks ssm exhaust system and its making the loudest ugly raspy sound at lower rpms . only when i put the petal to the floor do i hear a nicer sound that ive seen on youtube videos , prolly stupid question but does anyone know why this is ? thanks a lot
Is this the normal rasp headers add or something more sinister? If not, could you have an exhaust leak?
^^^This could be it too! I had a cracked exhaust manifold (header), and the car was very raspy at low rpms, when it was WOT, all the other noises drowned it .