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Discussion Starter · #1 ·
I was wondering why a lot of conversions specifically use the 2010/ 2011 Grand Cherokee exhaust manifolds versus the later ones 2012+.. The later ones have a two and a half inch outlet and the earlier ones have a two and a quarter inch outlet wondering what other differences there are and pros and cons. Trying to decide which ones to use on my conversion. Thx
 

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The earlier manifolds will make the least difference on the 5.7. Maybe 15HP/tq which you probably wouldn't feel. But if there's no difference in cost, clearance etc. then may as well go with the newer ones, run 2-1/2" all the way back.

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