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So the other weekend I pulled my toyhauler which is 42 feet long with my sandcar in the back. Total weight of the trailer i think was around 16k. I'm running matt's 8k tow tune, the truck is studded and the egr is blocked on both sides. I asked matt if i was ok to tow heavier if i keep an eye on...

I've been running the your tunes ever since i tuned the my 04 for the past 2 yrs. and now since i'm studded i want a little more. so what's the difference between srlx and extreme? i'm also seeing a tune thats a srlxx? but i can't see it on your website as an option. also, what are the cost of...