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Discussion Starter · #1 · (Edited)
Just came back from a "road trip" to the Rockies.

Two weeks ago, I had the Flowmaster Force II cat backs installed, and I also put on a 6.1 SRT air box bottom.

1919 (s)miles, 26.5 mpg for the entire trip, using "pure gas" 91 octane.

This exhaust system more than exceeded my expectations. Nice deep "rumble" at idle, a deep roar at WOT, and at highway/Interstate speeds, very quiet, with no drone at all. Yes, when MDS kicks in, you can tell it's running with only four cylinders, as the sound changes, but "that" sound is only slightly louder than with the stock suite case system.

Perfectly enjoyable and quiet cabin sound at 75/80 mph, cruising on I80 through the flatlands and into the Rockies, with MDS activated.

De accelerations through the down hills with autostick, just sounds amazing to my ears. Nice deep rumbling, with some "popping". :)

Can't say enough about the Flowmaster Force II system with the A5. Great balance between a nice "muscle car" sound, yet quiet at cruising speeds with no droning.

Very Happy


 

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Thanks for sharing this! I'm in the market for something better than what I currently have (Blastin' Bob's Magnaflow glasspacks). It's a nice sound, but not throaty and "muscle-y," for lack of better term. I like the price tag of the Flowmaster Force II system since I don't want to break my bank account right now. Glad you shared. Might make this purchase for my A5 now. :thumbsup:

PS: If you have a sound clip, I'd like to hear it. I've heard a few on YouTube and like what I'm hearing.
 

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Discussion Starter · #3 ·
Thanks for sharing this! I'm in the market for something better than what I currently have (Blastin' Bob's Magnaflow glasspacks). It's a nice sound, but not throaty and "muscle-y," for lack of better term. I like the price tag of the Flowmaster Force II system since I don't want to break my bank account right now. Glad you shared. Might make this purchase for my A5 now. :thumbsup:

PS: If you have a sound clip, I'd like to hear it. I've heard a few on YouTube and like what I'm hearing.
No sound clips, but I liked the YouTube clips too, and pulled the trigger. IMO, they sound way better "live" than the clips produced.

I'm very pleased with them, and I would do it again in a heartbeat! :)
 

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sounds like a great upgrade
 

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I've said this alot. These challengers are one of the best road trip cars out there today! Nice to know that you liked the new exhaust system and that you had a blast. Thanks for sharing:thumbsup:
 

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No sound clips, but I liked the YouTube clips too, and pulled the trigger. IMO, they sound way better "live" than the clips produced.

I'm very pleased with them, and I would do it again in a heartbeat! :)
It's great to hear that you are so satisfied with your Flowmaster Force II kit and that you were able to enjoy the sound of your new system throughout a long road trip! Thank you for sharing your experience!
 

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1919 (s)miles, 26.5 mpg for the entire trip, using "pure gas" 91 octane.


Where did you find that much pure gas? I've yet to find a place that doesn't have 10% ethanol...
 

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Discussion Starter · #9 ·
1919 (s)miles, 26.5 mpg for the entire trip, using "pure gas" 91 octane.


Where did you find that much pure gas? I've yet to find a place that doesn't have 10% ethanol...
Guess that I am lucky. The route that I take to the Rockies from my place, has stations in the right places/tank range, that made it happen easily.

www.puregas.org is what I checked for my route, state by state, and then looked at towns and distance.

This trip was the best mileage that I've ever gotten for an overall average. Zero'd out the EVIC in my drive, made the trip, and looked at the EVIC when I got back home. My EVIC has always been really close to hand calculations, so this is a pretty accurate number IMO.

Can't say that any one thing made the difference on the mileage, but since the last trip, I've added the Flowmaster Force II cat backs, 6.1 SRT airbox bottom, and used nothing but 91 octane pure gas.

Drove normal, with plenty of WOT's just for fun, several two lane "passes", 80mph cruising speeds, drive through fast food lanes, and a ton of mountain driving.

Always a lot of variables, so the exact "why so good of mileage" is hard to pinpoint or say, but IMO the combination of a few mods, and good gas produced these numbers.

26.5 average mpg for a trip with a Hemi isn't too shabby, considering I didn't really do anything except drive it like I normally do.........and that ain't just puttering around! LOL
 

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Another very happy Flowmaster Force II customer. 2014 R/T classic, 5 speed auto trans. I recently installed the system from stock exhaust with resonator delete. Can't imagine being any happier with an exhaust system and the sounds of the 5.7 Hemi making sweet music, thanks Flowmaster. It's tough to do but I drive as much as possible with the windows down here in Henderson/Las Vegas now just to hear the exhaust sounds better than with the windows up and A/C on. :guiness:
 

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Discussion Starter · #12 ·
How was the fit of this exhaust system? Any problems installing it?
The fit was very good. My local custom exhaust shop installed and welded them in in less than an hour, including removing the stock system. He was impressed, but stated that this was typical of Flowmaster products.

He charged me $50 to do the work :)
 

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Discussion Starter · #14 ·
Thanks for that info can you tell me what a 6.1 air box bottom is. I am looking at a new exhaust system on my Challenger I just purchased.

ReneeT.
The '08-'10 SRT 6.1 engines have a larger "air opening" on the OEM bottom air filter box. The unit fits the '09-'10 5.7 air box "top". The bottom holds the filter, but the larger opening can allow more air into the filter at higher rpm's.

Both engines use the same filter, so it's just a matter of swapping out the bottom portion, and using the 5.7 top portion that has the correct breather tube orientation that's needed. Poor man's CAI IMO! lol

I also have had the '11+ Charger intake tube (no sound baffle/goiter on it) that has the longer sensor. Installed that about 3 years ago, and just did the 6.1 box swap.

The engine does seem to pull harder on the top end at WOT. How much HP gain.............don't really know, but it is breathing better at the top end IMO.
 
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