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its probably nothing serious,but i have an sti8 with a few mods,couple including a full scoobyclinic 3inch system,magnex twin dump downpipe and rcm headers.prob is,after about 6months of this being on its started to get a bit raspy at high revs,bout 6k upwards.cant c any signs of leaks,but hard to c a lot as heat wrapped the headers n downpipe.any ideas please!.