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You used stainless riv nuts? Are you worried about the bimetallic corrosion between the stainless and aluminum? I used stainless riv nuts for my sun visors and now I'm thinking it might have not been such a good idea since I've read about the galvanic corrosion.
Haven't turboed it yet. It'll be a aftermarket setup. Probably mat style sound deadening.
I put a dab of antiseize on them as well. But the ratio of dissimilar metals plays a role in it. A SS fastener in aluminum is less likely to have issues than a aluminum fastener in SS. Since there's ports to get a straw on the inside, I will spray the inside as well to prevent issues.
I have done two things: dabbed holes with a little silicon sealant and used a plastic washer so the face doesn't contact the nut. Seems to do the trick even with Zinc-plated bolts. For sound deadening, I used stall mats. I'm amazed at how much the noise level went down. I used elevator bolts to hold the matts down to the bed. (they were zinc-plated.)
