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Is there much of a difference between 4-1 and 4-2-1 extractors? I've been having a look at a few different types, and I have my eyes set on either the OBX ones (4-1) or the Hurricane ones (4-2-1). Is someone able to tell me the difference?
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2010-2014: 2000 Mazda 323 Protege
2014 - 2016: 1991 Toyota MR2 SW20
2016 - Err, 2016: 2002 Mazda 323 Astina SP20
2016 - Err, uh, 2016: 1991 Mazda MX5 NA
2016 - 2017: 2000 Alfa 916 Spider
2017 - 2018: 2007 Alfa Brera
2018 - Current: 2018 Mazda 3 SP25
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