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4" is the biggest downpipe you are going to fit but 3.5" is really all you would need. Yes it can be done w/ cab in place
 

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From what I hear the 3.5" is easier to spool. Had a buddy put the 4" thinking "bigger was better" and said his spools like poop...
 

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Discussion Starter · #5 ·
hhrecovery said:
4" is the biggest downpipe you are going to fit but 3.5" is really all you would need. Yes it can be done w/ cab in place
Thinking of getting the MBRP 5" turbo back kit know is the the downpipe
3.5" or 4"
 
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