well i for one would like to see a tune from someone with a good idle with no fuel trims on a returnless system.
mine idles smooth after it sits awhile but then it gets too rich but the trims are still way positive.

 

Which years came with returnless fuel system on those trucks? Mine is 2003.

 

04+ unless it is flex fuel

 

flex fuel is returnless also isn't it?

 

The 04 ff I put in my dads truck was a return... Thats all I know...

 

oh gotcha.

 

So, 2003 Trucks have fuel return line, right?

 

Yup, mine does.

 

did you buy those 60's? if so did you get a flow sheet with them?

 

No, i didnt get a flow chart, but they are Standard Siemen DEKA 60's and the flow chart is on the web site. I will be installing them on Saturday. I will get some pics and let you know how they worked. I will be using my new multec adapter harness too . Oddly enough if someone could explain this to me, when i added the Corsa catback to my truck, i went from a 97% IDC on the 42's to a 106% IDC on the 42's.......not sure why. I think the 60's should fix that though.