Sounds like a heat shield rattle to me, get the car up in the air and bump the exhaust with a rubber mallet till you can locate the source of the sound.
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Minidave Well-Known MemberLifetime Supporter
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Not sure myself. I have the Alta intake and a Miltek exhaust, but I did have a heat shield rattle that was pretty easily taken care of before the two of those mods happened.
I will say that the Alta intake does make for a much louder whoosh and blow off when under load, though you'll have to be lugging the engine a bit to hear it. I did also get a GFB diverter valve which reduced that somewhat.
I'm not sure that's what I'm hearing though, so look at the heat shield first. -
It is hard to tell from that clip, but to me, it sounds like the diverter valve releasing pressure. That would be a normal sound. Without actually standing next to the car, that's the best response I can give.
CD