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sizes and spring-rate characteristics
0L EcoBoost engine in the Focus ST can overheat their oil very quickly within a few laps on the track or aggressive street driving
fresh air for maximum performance when you need it most
Finishing off this exhaust system are dual 12 IN diameter black 304 stainless steel clamp-on exhaust tips
cat-back exhaust
K&N Air Filter Foam Insert Block DSL Only (E-0644) - 85-2003 Electronic Lowering Systems sizes and spring-rate characteristicsThis is an optional foam piece which replaces the OEM foam block. For DSL model only Features & Benefits Pre cut foam insert that is ready to install Pre Cut And Ready To Install Downloads & Resources Link To Manufacturer Page Installation Instructions (PDF)
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