Matt, have you checked to make sure the exhaust isn't in contact with the lower crossmember? It's possible that you're mistaking rattle for rasp, as they don't sound entirely different from one another. Do you know which crossmember I'm talking about? Here's a pic, just in case. If that pipe comes into contact with the crossmember, it will resonate pretty significantly.
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"There are no small accidents on this circuit." -- Ayrton Senna
316.8whp & 248 ft/lbs (Dyno Dynamics) | 319whp & 256 ft/lbs (DynoJet) (04/23/10)
Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.
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