Carbon huffing animal
Join Date: Jul 2009
Location: Knox Vegas, TN
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a 6.0 exhaust does not sound "diesel like" at idle due to the VGT turbo. It will right at start up, and turn into a "jet type" sound as the vanes adjust based on programming. I really like the sound of a 6.0 exhaust, but to really hear it while driving, you generally have to be next to something solid like a concrete barrier or building, and heavy throttle.
the '03's have a very loud turbo because they have less vanes that the newer (louder, higher pitch jet sound - YouTube it), so if yours is loud like that, someone may have done an '03 turbo swap, which is not unheard of.
Ultimately to answer your question, it would be easier if we understood what you meant by your ".......exhaust coming out of the tail pipe is weak"
Are you talking sound wise, or do you think it has blockage of some sort maybe in the catalytic converter and causing power loss.
ERIC - Tennessee Powerstrokes Chapter Director
2011 K1500 Silverado Z71 5.3L Vortec
2004 F250 Super Crew FX4 Powerstroke
1997 F250 Super Cab 4x4 Powerstroke
2004 K1500 Silverado Z71 5.3L Vortec
1999 F250 Super Crew 2WD Powerstroke ZF6
1998 K2500 Silverado 5.7L Vortec