Got my Magnaflow exhaust installed the other day and the guy that installed it said I should also look into replacing the stock cats if I am wanting to get more power out of the 4.6L. For those that have replaced the stock cats, what brand and model # did you use? Would I throw any codes if I was to replace them. So far all I have done to the exhaust is have a Magnaflow 12158 muffler installed (14" 2.5"/ dual 2.5" out) side exit. Thanks for the help.

Andrew

 

He's talkin about these..

http://www.ninosport.com/Metal-Cat-C...&category=1074

http://cgi.ebay.com/ebaymotors/Metal...QQcmdZViewItem

http://www.troyerperformance.com/cgi...c%20Converters

Are you going to notice a 5hp improvement at peak in a 5000lb+ truck.. doubt it.

 

the factory cats are as high flow as they come

 

i was thinking about the high flow cats myself with a true dual setup. muffler shop guy told me i was crazy if i wanted to do that to a near $ 40,000 truck. he said if they were off on anything they did i would have problems that i would have problems with check engine lights that they wouldnt be able to fix without going back to what i currently have. he refuses to do the job.
theres got to be some more advice on this issue out there. lets get some more replies to this thread guys.
thanks