i was wondering were i could get some new cats for a 2001 f150 and what kind should i get that are not to expenseve

 

Why do you want new ones?

The stock ones will flow as much as needed.

If yours are bad, they still may be under warranty depending on mileage and where you live. The federally mandated emissions warranty is a lot longer (and covers a lot more) than most owners realize.

Steve

 

they wont be under warranty i bought it used plus i have 117,000 miles on it looking to buy some new ones will they help it sound better and will it get better gas millage

 

Yep. Out of warranty.

You'll get neither of those items from cats anyway unless your old ones are plugged.

Steve

 

well i have a rattling noise in my under carriage and i thought it might be my cats

 

Look around for loose heat shields or check the welds on the exhaust. If all it is a broken weld you shouldn't need more than 15 dollars at Meinike or if it's an heat shield, tighten or remove it.

Hope you find/found the offending noise

 

A hose clamp works wonders if it's just a loose heat shield.

Tap the cat with a rubber mallet and listen for noise from inside. If it rattles internally, replace it before it completely kills your exhaust flow.

You really need to get under there if you haven't already and perform a proper inspection so you know what your exact problem happens to be.

Steve

 

If you determine that you need cats, Magnaflow high-flows are about $60 each on E-Bay.