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Discussion Starter · #1 ·
2008 F250 I currently have the S&B, cold air intake, and cat/dpf delete pipe. I am running the Spartan on the 275 tow tune.

Would I benefit from upgrading to a 4" turbo back exhaust system?
 

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I have 5" back...sounds awesome!
 

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Gotta do the full size down pipe. That's all I have left I can do without getting into the engine. 275 wow, im on 250ll, that's gotta be sporty! Im waiting to get off 14hr shifts to put on a new fs2500 oil system.
 

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Ok with the new down pipe she sounds like a truck again not a pissed off hair dryer! Really helped the throttle response. Only lag now is turbo. Be ready for a huge cloud! I had one tailgaters headlights turn on it got so black . I laughed. He didn't tailgate no more! Ps im running 275 l.l. now. Wow! Shes squirrelly.
 
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