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Tru2Chevy · 01-18-2010, 10:17 PM

I think you are fine with the 4" system (which muffler / tip setup is it?) since you are trying to evacuate quite a bit of air from a 6.0 with a big cam.

Even if it is a little on the large side, switching back to a 3" catback would most likely take away a little upper RPM horsepower, although it would also give you some low speed torque as well. If you are really worried about the 4" catback, I would look for someone with a 3.5" setup that wants to upgrade and see about a trade. I think jumping back to a 3" is the wrong idea, especially if you are thinking of more power in the future (like your aforementioned head swap).

- Justin

01-18-2010, 10:17 PM	#8
Tru2Chevy Co-Founder / Site Admin Join Date: Jul 2004 Location: Ewing, NJ Posts: 22,476 iTrader: (8) Social Networks:	I think you are fine with the 4" system (which muffler / tip setup is it?) since you are trying to evacuate quite a bit of air from a 6.0 with a big cam. Even if it is a little on the large side, switching back to a 3" catback would most likely take away a little upper RPM horsepower, although it would also give you some low speed torque as well. If you are really worried about the 4" catback, I would look for someone with a 3.5" setup that wants to upgrade and see about a trade. I think jumping back to a 3" is the wrong idea, especially if you are thinking of more power in the future (like your aforementioned head swap). - Justin __________________ 1999 Camry - Beigemobile DD 2002 Suburban - Wife's DD 2004 Grand Cherokee - Not running / Project / Selling?