I found a guy that is selling these maggies pretty cheap and will combine the shipping for me, but what I would like to know is if these are the right size?

Heres the link: http://cgi.ebay.com/ebaymotors/ws/eB...TQ:MOTORS:1123

By the way the truck is a 98' with the 5.4

 

yep, 2.5" will work out. Part # 94006 & 94306 work for the 97 - 03s well.

 

If the exhaust is stock then yes it will fit.

 

Why would it have to be stock? I'm running 2.5" pipe into a si/do flow.

 

He probably means stock size and that you have the original 4 cat system, that it will fit as a good replacment.

 

whats the difference in those two styles of cats ? the 94006 vs the 94306?

 

I think that one has O2 holes.