Where can I get some? I don't have emissions where I am at, but incase I move somewhere where there are, I'd like 'em. This won't void warranty will it??

 

I cut my cats off and it didn't help anything. It did, however, make the truck louder, and now the exhaust smells like raw fuel. If you weren't looking at my truck when it's idling, you'd think it was a 1985 model!

 

Im in the same boat. I have sido flowmaster series 40's and want it to be louder. I was also wondering will high flow cats make it louder or what can i do. Thanks

 

I got mine from E-Bay, I think the seller was performancepeddler. About $60 each for Magnaflow high-flows...at least that's what I paid two years ago.

 

I got my high-flow cats from www.performancepeddler.com for 50 bucks each when the f150.net code was working. it makes the exhaust louder and you pick up a little power, now if you cut them out and leave them out you loose low-end TQ

 

I put high flows on mine, and you cant smell it at all, it actually has lower emissions than when it had all 4 stockers on it. Gained 8hp on the dyno too! I used magnaflow

 

Yeah, everybody says that, but if you can feel the 1 ft/lb of torque or so it supposedly loses, your butt dyno is better than mine.

 

does anyone know the number of cats size of the opening on the cat needed for an '06 FX4?