will a set of 1999 f150 5.4l obx headers fit my 1997 f150 4.6l?

 

I don't see why not. Same block.

I know these will fit tho, if you ahven't already bought them, there is ppl on here running these......
http://www.autopartswarehouse.com/de...227.html?gan=1
mine arrive 2moro...putting them on next week hopefully.

 

i found a set on ebay with 2 high flow cats, a Y pipe and long tube headers all stainless steel. but they say there for a 1999 5.4l so i wasnt sure if they would fit for $495

 

the obx long tubes don't have cats, they are resonators.

 

what do the resonators do?

 

Keeps exhaust more quiet. If your looking at having to pay someone your looking at atleast another $500 too for the install.

 

They are not the same block. No they will not fit. There was a guy on here named Jackal that tried putting some on his 4.6L and they needed to be modified extensively and I don't remember if he actually got them on or not.

 

the $475 sets come with resonators, the $695 kits come with high flow cats(prices are from sparktechmotorsports)

 

^ This.

I think he got them on but had to have some custom cutting and welding done. Aren't the Pacesetter 4.6 LTs out?

 

Ohhh, i didn't know that sorry. i hate when i slip up and give out bad info! lol I was thinking that the 5four was just a stroked out 4six, but your right. I don't kno about teh obx then, but the pacesetters i got fit both.