Rb20 - Weird Rumble On Idle+acceleration

[f3lix]

Hey guys,

The story is i gave the car a bit on the freeway and now under acceleration it is making an unsual rumble which u can clearly hear from the exhaust. it also rumbles when on idle. i have noticed that my catch can indicator is full and i have a tube that jus runs down the engine bay (let out excess oil?) and was leaking alot of it. ihave bought the car with all mods as is and have had it for about 8months with no such problems before.

can anybody help me out or tell me if more info is needed

Cheers guys

Felix