More towing power from the 6.0

[Bditt]

I have an 05xl denali stock 6.0l with 230k on it .i pull a 7700lb travel trailer with it. Stock size tires p265/70 r17 and stock gears. Aftermarket air filter. No problem towing it.

 

[chris jenson]

I agree on the black bear tune. Money well spent.