It has about 3 chambers. A borla is the way to go but really not going to give you much HP. The OE mufflers flow well enough. The BB tune is what helps.
I looked high and low for a 2500....Everyone I looked at was a POS. They are beasts.
The only downside to the 800's is the 4 speed transmission. They cannot be upgraded to the 6 speed.
I received an email from Shelton Buick to offer to re- purchase my Denali XL back from me. I paid 17,200 for it in July 2019. Had 134k miles. The offered me $ 11,000.....:-( Now has 164k on it.
Not that I am selling it...It does have 2 small rust spots on rear quarters.. but runs great. I put...
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