I have a 4.6, but my fiance has a 2006 4.0 v6. I want to know if adding a catback will yield any performance results, or would it just change the sound. Also would she se any gains from simply changing the muffler to a flowmaster, magnaflow, etc... What do you guys recommend?

James

 

even with a gt take off muffler youll see 6-7 hp and mrt makes like 8-10. So just a muffler swap will do. Catback duals dont make much more gain than just changing the muffler maybe 1-3hp. So really all you need is a single. MRT is really loud single. Also peopel seem to like the flowmasters

 

Thankyou petepete. So apparrently the major restriction in the exhaust of these cars happens to be the muffler? Weird cause on my 03 gt changing the mufflers do nothing but make it sound better.

 

yep big restriction o_O

 

So until what power level will the stock exhaust with just a changed out muffler support?

 

scrming only has a mrt muffler on and supercharged running at 313rwhp i think. The word is that the stock pipes are very good just the muffler sucks

 

Even though it is a y pipe instead of say an x pipe of h pipe?

 

And how difficult is it to install?

 

yep and install is easy dont even need to lift it if you dont want. Just unbolt the hangers and clamp put the new muffler in boly back. You only need a 13mm and 15 mm wrench and should only tk emaybe 30 min- 1 hour

 

Thanks for all your help pete. I will post some pics of her car later on tonight. I just finished claying it, polishing, and waxing, and having some tints put on, but thankyou for all you help.


James