yeah that would seem to make the most sense...thanks Monte.

which version is best on the u7135...i have a 2007 5.7l hemi and I run the 93 cai tune from version 9r20r...is there any difference in the canned tunes from an earlier version?

whoa,whoa, whoa...easy guys , not everybody all at once! ...and this is supposed to be a support forum? sheesh , lotsa help in here!
Thanks for your input at least, Laramie!

2007 300c 5.7l w/CAI and catback exhaust mods

What determines when and how much fuel to add across rpms...I know the air fuel ratio and the ST & LT knock are the determining factors but what numbers should I be looking for?
I have the 9r20 and am pleased so far with both 91/cai and 93/cai tunes but ...

Don't u have to retard the timing 2 degrees with the 89 tune? Or did I read that wrong with the 9vr20 version?

You might have to reset the abs/esp system with it unhooked for that long. But great question as I have to do battery ground upgrade myself soon!