I've always thought it could be something to do with the flywheel though... It sounds just like when you disengage the clutch at a stop, only really f ING loud and only at right before 4k rpm under load
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2010 370Z Touring MT | Stillen | Motordyne | Momentum| Z1 | Fast Intentions | Advant Garde | RE11 | Swift | SPC | Quaife | Whiteline | Evo R | 322RWHP 259ft-lb Mustang
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