ISX400 Tune

[tree98]

(01-14-2020 )izmail0513 Wrote:  Hey guys im new here. Bought this Walmart Cascadia with Cummins ISX400ST
Was it designed to handle 500hp? Rear axle ratio is 247
Should I or just leave it as it is. Whats the pros and cons. Is more HP better mpg? Just trying to figure out what's the best tune for this engine. Or its better to leave it as is. Here are few eng pix
Thanks in advance guys

Spend the money on changing your rears to a better ratio, 2.47 is absolutely horrible. You probably already have liner fretting issues. More horsepower is the last thing you should be concerned with right now.