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I'd put new cats on, hook your 02s back up and run a good quality muffler (since all that's gone,) and you should notice more difference than taller tires...
all 96 and newer 400s have a "high flow cat," so there is no use removing it other than killing your flowers faster. I guess I read your sig wrong, thougt said you have o2 delete and straight pipes.
Py0 is the rpo for the hd aluminum wheels. I believe great white stated that they were lighter then the factory steel wheels
Adam
I Hate small phones & fat fingers
Finally got around to weighing the steel wheels: 34 lbs! that's 136 for 4.
The PY0's scaled in at 17 Lbs. That's 68 lbs for 4.
That's a whooping 17 lbs per wheel and 68 lbs total difference!
Exactly half the weight.
No wonder the difference in the truck is so noticeable.....that's a huge weight drop in one of the most effective areas!
I've installed aluminums on vehicles before but never with this much of a difference. But to be fair, they were pretty much all aftermarket rims or older oem aluminums built before the rabid gov't pursuit of improved mpg.
Viva la tightening OEM MPG requirements!
I'll just quote my own post rather than type it all out: