5Sp Getrag with a Solid Fly Wheel. HELP!!

[Double_Leggers]

Okay so i brought a completely stock apart from a stage3 chip series 1 s pack about a month ago and when test driving it i heard a rattle/grinding noise when in low revs (taking off, inbetween gears etc..) the previous owner told me he had the gearbox pulled out and sent away and was told it was caused by a solid fly wheel conversion. Ive done some research and believe this is the case, my question is, is there anything that i can do to lesson the noise or remove it all together?

will an exhaust and headers drown this sound out?

[DLFHUB666]

Put the stock clutch back in.