Originally Posted by 114x4s
Your gonna get lots of advice and suggestions, but your not truly gonna figure it out until you hear different setups in person. Typically the largest case mufflers will produce a quieter sound. I am leaning toward a 70 series flow master myself but can't find anyone running that setup. There is a thread on here for that setup but no pics or videos posted yet. Good Luck!
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Actually, I just had one installed yesterday. I went with the Flowmaster 70 series, the dual 2.25" intakes, one 3" out. I had them remove the factory Y-pipe altogether, and run each pipe separately to its own intake on the muffler. It's part number 524703 if you want to look it up.
I am still testing it out, but so far, I really like it. It has a nice growl when you get on the throttle, but otherwise, it's not much louder than stock. From 4K to the redline, the engine feels a lot more responsive, a huge difference from the stock cat-back setup. At higher RPMs, you can really tell how restrictive the factory muffler really is.
Cruising at 70-80 mph, there was no drone at all. There was some light rumble, but it disappeared if you have the radio on. I can make it drone with brisk acceleration from about 2200 to 3200 rpm, but it goes away once load is taken off of the throttle. I'm curious to see what effect this has on gas mileage. I'll have to get back to you on that.
Overall, I really like this setup. Some guys on here have gone with 40 and 50 series Flowmasters, but with a lot more drone in the cab. The 70 series really seems to have that solved. If you're looking for very loud, then the 70 series if probably not for you. But for correcting the restrictive nature of the stock exhaust, it's a fine choice.
I have a 2012 CC with the 4.0 V6 engine. The pipe sizes are 2.25" before the stock muffler, with 2.5" from the muffler and on out the back. I was able to use the stock pipes to right before the Y-pipe, but I was not able to use any of the stock 2.5" pipe. So they ran all new 3" pipe from the Flowmaster, routing the same as the factory exit pipe.
Yes, I know. You want pics of this. It's midweek and I don't have time to get up under the truck. But I will put the truck up on ramps and have a photo session for you guys so you can see how I did it. It will probably be this weekend, but I will get it done. While I'm at it, are there any pics in particular you would like?