I recently purchased a 05 SCREW FX4 and would like to upgrade the stock exhaust. One of the trucks I test drove had a flowmaster on it and I loved the sound, but I am wondering if there are other options that are better. I am looking into the Flowmaster 40 series but Im open to suggestions. Thanks

 

I have the Flowmaster 40 and love the deep sound. The knock against it is that you lose a little low end torque, but that was not important to me. I wanted teh sound.

 

How loud is the 40 on the interior because I'm looking for a moderate external tone with limited internal tone and have been pointed toward a 50 series instead.

 

You can hear it slightly. But that is what I wanted. It's music to me. It is not a loud drone at all.

 

40 Series FTW. Can barely hear it at cruise in the cab over my radio.

 

Org. 40 is king of the Flowmasters!

 

Well today was my birthday and took my "presents" and broke down for a original 40 series on my truck. It sounds amazing and was exactly what i was looking for. The cab drone is a little louder than expected, but not much more over stock. Now i feel my truck has the real sound a V8 should have.

 

Congrats on the purchase. I have a flowmaster on mine and love the sound, I went with the Super 44 though.

 

Thanks! Now i'm looking into saving for a CAI. Any suggestions for a brand are welcome because it'll be the first time ive added one on my vehicle.

 

Get a tuner with custom tunes instead of a CAI. Just do the Gott's mod.

If your 2005 is a 5.4, you run the risk of running lean with a CAI and no custom tune.

 

What tuner would you suggest??

 

I ran a Spectre CAI on my stock 05 5.4 with no issues. I just recently got a tuner on eBay cheap though and that made a bigger difference then the CAI did

ETA the tuner I bought is a Max Micro Tuner

 

and how did you know you weren't running lean?according to your wideband?

 

How does he know he wasn't running rich?