Thinking about buying a 6.4 performance?
Im more familur with the duramax when it comes to performance, i know with them once you go above 90-110 rwhp you can take out the stock tranny. Were is the good point for power to stop at with a stock tranny on these? I would be buying an auto. I pull a 13k camper right now but will be upgrading in the future to a heavy toyhauler proably about 18k. I was thinking like the spartan 210 tune 4" exhaust with dpf delete. Would this be safe even pulling 18k? What kind of mileage is the best with what tune? And the spartan tunes are them to the rear wheels or fly wheel?