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After hours of search i found that the rattle is coming from the right side by the exhaust manifold from there i cant pin point. I can say that if the manifolds are cold (the cats are there too) then there is a very very tiny sound but once you do some 0-60 pulls ofcourse after the engine warmed up properly then do it and park you can rev the engine at exactly 1200-1300 rpm and you get that sound the sound comes only after you hit that rpm and let go then the back pressure seems makes something rattle next to the second set of exhaust manifolds in the back.
PS: this started very abruptly also...as in the last 3-6 days i started to hear it once i started to spend a lot of time in traffic the engine would heat up very nicely with in its limit no over heating that is.
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