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Installed #817666 Flowmaster Dual Exhaust on my '14 High Country

TedH

By TedH
in Engines & Drivetrain

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TedH Enthusiast

TedH

Posted
Posted

First, thanks for adding that 'robot' step... lost my ENTIRE post so I get the pleasure of re-typing it from memory.

 

Had the Flowmaster #817666 system installed on my '14 Saturday. What a great sound and I am seeing about 10% improvement in fuel mileage. Impressed. Went with the side exits behind the wheels. Installed a K&N filter day of purchase. No plans for further performance upgrades.

 

Naysayers came out of the woodwork when I posted on FB:

Flowchoker

won't improve mileage

more restrictive than stock

 

Then, a couple guys got into a shooting match on the thread about using a hand-held (Diablo) vs paying $250-350 for a pro to tune the combination (K&N filter, stock 5.3L and the Flowmaster system). They got pretty heated too.

 

Muffler is the 'Super 50' (single 3" in, dual 2.5" out) and polished stainless tips.

 

What I read about Flowmaster cfm: They SLOW exhaust gases by company's own admission. But, they introduce scavenging which speeds the gases back up but likely not to the inlet speed. Also, that the mufflers offer more consistent tone over life of the muffler (no settling to increase noise compared to the packed, straight thru Magnaflow or glasspacks). So, more predictable sound for the life of the system, performance improvement (low-end torque) and mileage (as I have observed).

 

409S system. Some say it will rust but it is also dipped in the aluminizing coating so it may take longer than just 'bare' 409S.

 

I observed both mileage and performance improvements (acceleration). Sounds GREAT on start-up too! V4 drone may take some getting used to. Thoughts?

emeryz28 Enthusiast

emeryz28

Posted
Posted

what did the system run you? where in Tampa Bay are you.....I would love to hear what it sounds like.

 

I just purchased a Diablo from someone on here so I could disable the AFM and get rid of V4 mode. I had Phil from Tampa Tuning tune my Camaro he did an awesome job, he said he can do the truck to. I wasn't looking for performance, just wanted to disable AFM and recalibrate speedo when changing tire size. I would suggest getting a Range AFM module, getting a tuner or having the truck tuned to remove the V4

TedH Enthusiast

TedH

Posted
  • Author
Posted

I will probably leave the V4 enabled as I want to get max MPG as it is my commute vehicle.

 

It is a very deep rumbling exhaust. Almost too loud. Louder than that clip on youtube by Flowmaster. I got a 10% discount online and paid about $700 + tax. Then, $161 for install. Some say I got robbed on price but $770 was the going rate at all of the online stores for this kit. Rainbow in St Pete said they could have fab'd using aluminized steel for $450 installed but not sure I would have gotten the nice polished stainless tips, super 50 and fit and finish.

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