I installed a Flowmaster single 3" (force 2 I think) on my last truck, the install was gravy, as stated before getting the old crusty stuff off is always the hard part. It sounded muscular but was not at all overbearing and best of all it was still in fine shape after 7 years of service. I'd highly recomend the Flowmaster catback, especially the 3" single with 3 chamber muffler.

 

I'm looking for the cheapest place to order my flowmaster for my 04 f 150 5.4l

any help?

 

Cheapest place I have found yet:

http://www.performance-curve.com/ind...TS&Category=14

 

Some may not like this, as it doesn't lead to jumping on the Flowmaster bandwagon, but from the research I did before buying I was informed that the Dynomax is what you'd want based on your original performance criteria. It seems Flowmaster sells for its sound, but the Dynomax mufflers generally outflow them by at least 100 cfm.

My advice is for you to call Summit racing and speak to their tech guys. These guys have the stats for everything (as Summit's main focus is performance for racing), and are 99% of the time more than willing to spend the time it takes to get your vehicle set-up correctly (if you are going for performance). I ended up with a single exhaust with a higher-flow muffler (compared to the Flowmasters). The single exhaust maintains the scavenging effect needed for performance, and overall it is less weight than a Flowmaster dual system (which isn't a true dual anyways... i guess it is more for show and sound?).

My goal was better fuel economy, which I think I achieved. In the end the truck sounds great, too.

Like pantherpics's experience, I used an angle-grinder with a cutting wheel to make a slit or two on the outside pipe under the cab of the truck. I used the same wheel to cut the rusted u-bolt nuts off, too.