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Flowmaster 817654 - Header-back System 409S - Dual Rear or Side Exit - Moderate/Aggressive Sound

Name: Flowmaster 817654 - Header-back System 409S - Dual Rear or Side Exit - Moderate/Aggressive Sound (817654)
Brand: Flowmaster
SKU: 5b000288259b31d67f88733e
Price: 682.95 USD
Availability: InStock

$682.95

$759.00

You save: $76.05 (10%) off MSRP

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This part fits

1972 GMC C15/C1500 Pickup Base
1972 Chevrolet C10 Pickup Base 5.0L V8 cid:307 cc:5031
1972 Chevrolet C10 Pickup Base
1972 GMC C15/C1500 Pickup Base 5.0L V8 cid:307 cc:5031
1971 GMC C15/C1500 Pickup Base 5.0L V8 cid:307 cc:5031
1971 GMC C15/C1500 Pickup Base
1971 Chevrolet C10 Pickup Base
1971 Chevrolet C10 Pickup Base 5.0L V8 cid:307 cc:5031
1970 Chevrolet C10 Pickup Base
1970 Chevrolet C10 Pickup Base 5.0L V8 cid:307 cc:5031
1970 GMC C15/C1500 Pickup Base
1970 GMC C15/C1500 Pickup Base 5.0L V8 cid:307 cc:5031
1969 Chevrolet C10 Pickup Base 5.3L V8 cid:327 cc:5358
1969 GMC C15/C1500 Pickup Base
1969 GMC C15/C1500 Pickup Base 5.0L V8 cid:307 cc:5031
1969 Chevrolet C10 Pickup Base
1969 Chevrolet C10 Pickup Base 5.0L V8 cid:307 cc:5031
1968 Chevrolet C10 Pickup Base 5.3L V8 cid:327 cc:5358
1968 Chevrolet C10 Pickup Base 5.0L V8 cid:307 cc:5031
1968 GMC C15/C1500 Pickup Base 5.3L V8 cid:327 cc:5358
1968 GMC C15/C1500 Pickup Base 5.0L V8 cid:307 cc:5031
1967 GMC C15/C1500 Pickup Base 5.3L V8 cid:327 cc:5358
1967 GMC C15/C1500 Pickup Base 5.0L V6 cid:305 cc:5012
1967 Chevrolet C10 Pickup Base 4.6L V8 cid:283 cc:4638
1967 Chevrolet C10 Pickup Base 5.3L V8 cid:327 cc:5358

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Authorized Dealer

About this product

Part #: 817654

Flowmaster's American Thunder crossmember-back exhaust system for the 1967 - 1972 GM C10/C15 1/2 ton 2WD (Coil Spring) pickup truck is perfect for the person looking for moderate to aggressive sound levels with all of the performance benefits that you would expect from Flowmaster. This crossmember-back DOR/DOS (Dual Out Rear, Dual Out Side) system features dual Super 44 Series mufflers, 2.50 in. mandrel bent 409S stainless steel tubing and all the hardware necessary for a great fitting installation. (Stainless tips sold separately). This system is routed in a fashion that accommodates both long and short wheelbases with automatic or manual transmissions, and provides adequate clearance for substantially lowered vehicles. The exhaust system is covered by Flowmaster's Lifetime Limited Warranty.

More Details

Exhaust Series	American Thunder
Exhaust Type	Dual
Exit Position	Dual Out Side
Exit Position	Dual Out Rear
Exit Style	Straight
Heat Shield Attached	No
Inlet Diameter	2.500 in.
Inlet Inside Diameter	2.500 in.
Material	Stainless Steel
Muffler Count	2
Muffler Part Number	Kit Only
Muffler Series	Super 44 Series
Outlet Diameter	2.500 in.
Outlet Outside Diameter	2.500 in.
Single or Dual	Dual
Sound Level	Moderate/Aggressive
System Type	Header Back
Tail Pipe Diameter	2.500 in.
Tip Quantity	0
Title	Flowmaster 817654 Crossmember back 409S - Dual Rear or Side Exit - Moderate/Aggressive Sound
Tubing Diameter	2.500 in.

Additional Documents

See what our community says about flowmaster products

550

Sam Jacobson

2013 Dodge Dart

What made you choose this particular product?

I wanted a little more rumble from the car at idle.

What were you trying to accomplish by adding this product?

Have more idle, replaced the Flowmaster dBX muffler for the HP-2 Shorty.

Once you’ve had a chance to use the product, did it meet your expectations?

With resonated tips added at the same time, I have enjoyed the sound of my exhaust more than I ever have! When the car is cold my car's exhaust pops louder than ever and I love it! It is a muffler rated way higher on the Flowmaster exhaust chart!

View on Sam's build

493

Dakota Haynes

2014 Ford Mustang

What made you choose this particular product?

Performance and sound

What were you trying to accomplish by adding this product?

Power and sound

Once you’ve had a chance to use the product, did it meet your expectations?

Very happy with it. Car is very loud but with a nice deep tone.

View on Dakota's build

3.0k

Jacob Crabtree

1987 Chevrolet Monte Carlo

What made you choose this particular product?

the sound

What were you trying to accomplish by adding this product?

get rid of the crap mufflers on my pypes exhaust

View on Jacob's build

157

Aaron Hancock

1998 Chevrolet S-10

What made you choose this particular product?

My brother had it installed for my birthday.

What were you trying to accomplish by adding this product?

More horsepower and opening up the exhaust more.

Was it easy install? Any installation tips that will help others?

I had D&W Tire install it for me. They did a great job with reworking the exhaust for me.

Once you’ve had a chance to use the product, did it meet your expectations?

Good price for labor and parts. Made my little truck sound really good.

Any additional comments?

Nope

View on Aaron's build

192

Jon Lynn

1998 Chevrolet Corvette

What made you choose this particular product?

Good sound, not much performance increase

What were you trying to accomplish by adding this product?

Added a much better sound than stock, but could be louder

Was it easy install? Any installation tips that will help others?

Required welds, had to outsource

View on Jon's build

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WARNING: Cancer and Reproductive Harm www.p65warnings.cs.gov

*Some manufacturer restrictions apply.

About Flowmaster

Manufacturer of performance exhaust systems, mufflers, cold air intakes, turbo boost modules, catalytic converters, race mufflers, headers and numerous exhaust accessories for late model cars, trucks, off-road, Jeeps, SUV’s, classic muscle cars, powersports vehicles and more. Flowmaster® gives you lots of exhaust choices with 12 designs of chambered mufflers, 3 styles of our exclusive “laminar-flow” mufflers and a new line of FlowFX “straight-through” performance mufflers, along with 5 sound categories of exhaust systems, giving you the customer, the power to custom tailor the sound of your vehicle whether you prefer mild, moderate or aggressive tones and sound levels.

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