WildHorse
N/A or GO HOME
- Joined
- Jun 28, 2017
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- '17 S550
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I don't think it's about sealing. It makes the boot easier to remove. Especially when the boot is near exhaust manifolds and/or headers. Hemi-style plug locations really doesn't need any IMO.so a light coat inside the boot is plenty to seal out air and moisture.
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