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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: 649.95 USD
Availability: InStock

$649.95

$722.95

You save: $73.00 (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

142

Shawn Gordon

1994 Chevrolet Suburban

What made you choose this particular product?

I was looking for a better flowing cat as well as piping as the factory piping was horrible for flow.

Is this your first time buying from this brand? Did you consider other brands?

First time Flowmaster purchase

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

I had my car mechanic install as my driveway isn't safe to work on the truck.

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

Really smoothed out the power delivery of the engine. Doesn't feel like it's struggling to rev.

View on Shawn's build

293

Travis Pessina

2006 Dodge Charger

What made you choose this particular product?

Price, performance, sound is incredible

Is this your first time buying from this brand? Did you consider other brands?

Yes

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

Professional installed

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

Good price for the performance

View on Travis's build

Wadie Elam

2003 Ford F-150

What made you choose this particular product?

I honestly like it really gives the truck a new sound and wakes it up some

View on Wadie's build

2.4k

Timothy Moore

2001 Volvo S60

What made you choose this particular product?

After doing a good deal of research on different mufflers, and running into Summit Racing Equipment's video on Flowmaster exhaust series comparison video, I decided on this Super HushPower 2 muffler, which ended up being the right choice!

What were you trying to accomplish by adding this product?

My old exhaust system was rusting out (but not severely), so I thought it would be a nice project to get rid of it in favor of a lighter, better-sounding custom setup. I wanted something very sporty, but not aggressive, or too loud.

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

Mostly yes because this part of the exhaust project was easier to put up with than the glasspack--both before and after making changes. This one was a bolt-on both times. It is secured with v-bands in case I want to swap it out, or remove it easier when I want to do something in the rear, such as dropping the rear subframe, for example.

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

At first, my expectations were rather mixed. It was a bit louder than I expected before installing the glasspack, and the raspiness was more of a thing before I rearranged the exhaust to have the muffler closer to the rear. Moving it to the rear gave it the more preferred low-tone, "burbling" exhaust note I was looking for, but either way, it always sounded good--especially with a glasspack. I was even told by a few people that it sounded like a V10, noticing how similar 5-cylinder and V10 engines sound!

Any additional comments?

Definitely a nice, lightweight, and not-too-loud option for custom exhausts! It is on the quieter-end of the Flowmaster exhaust aggressiveness spectrum after all.

View on Timothy's build

Connor Martin

2015 Ford Mustang

What made you choose this particular product?

It sounded really good on the car

What were you trying to accomplish by adding this product?

Make the car more vocal but not obnoxious

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

I paid someone to install it

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

Yes it was worth every penny

Any additional comments?

Very deep sounding exhaust. 10/10 product

View on Connor's build

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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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