High flow y-pipe? Shorty hedders.(update)

[pilate74]

I am trying to get a little better fuel economy for my 93 suburban. I have a set of flowtech shorty hedders sitting in storage. Would it be worth it to get the y-pipe as well? The converter is clogged and I am getting rid of it altogether. I am also considering a cfm tech throttle body spacer. I am also doing a full tune up (o2 sensor,plugs,wires,ect..)and throttle body overhaul. Any other fuel economy tips?

Thanks
Rob

Quick update. Overhauled tbi unit, new coolant sender for computer, new fan clutch and can of seafoam in the intake. I went from 9mpg to 14.4mpg @ 65mph.

 

[pilate74]

I am going to put in a new egr valve and o2 sensor next week.

 

[shady]

thats a pretty major increase I'll be happy when I get my 88 to 14mpg