Flowmaster 817661 - Force II Crossmember-Back Exhaust System

About this product

Flowmaster's Force II Crossmember-back system for the 1974-1979 Chevrolet Corvette is perfect for the person looking for a moderate exterior and mild interior exhaust tone, with all of the performance benefits that you would expect from Flowmaster. This bolt-on DOR (Dual Out the Rear) system for the 5.7L V8 features specially tuned stainless steel 60 Series Delta Flow mufflers, a Scavenger X-pipe assembly and 2.25" 409S stainless steel tailpipes. Like all Flowmaster systems, the pipes are all mandrel bent to reduce any restrictions and maximize performance. The system finishes with 3.00" polished 304S stainless steel tips. The exhaust system is covered by Flowmaster's Lifetime Limited Warranty. Designed for an easy fit, this system includes all necessary parts and hardware for installation. Note: Intended for Off Road Use Only on 1975-1979 Models.

More Details

See what our community says about flowmaster products

3.4k

Neo Falcon

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 Neo's build

157

Gianfranco Estremadoyro

2009 Ford Mustang

What made you choose this particular product?

Loudest axlebacks in the market for the 3V with out compromising the "muscle car" sound.

What were you trying to accomplish by adding this product?

Make my car louder.

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

Install was easy to do with the car lifted on ramps in my driveway.

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

Met all my expectations.

Any additional comments?

I absolutely love this axlebacks and would recommend them to any 3V owner.

View on Gianfranco's build

47

Logan Salazar

2011 Ford Mustang

What made you choose this particular product?

Much better sound and better performance

What were you trying to accomplish by adding this product?

Muscle car sound and look

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

Definitely make sure to use lots of grease to slide the parts together and adjust

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

It exceeded my expectations exponentially, the raspyness of the exhaust really makes the car stand out.

View on Logan's build

166

Josh Stetz

2011 Dodge Charger

What made you choose this particular product?

Highly recommended and great sound.

What were you trying to accomplish by adding this product?

Improved sound over stock mufflers.

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

Had them professionally installed also did a resonator delete.

View on Josh's build

15

Justin Iverson

2001 Pontiac Grand Prix

What made you choose this particular product?

Sound and quality

What were you trying to accomplish by adding this product?

Louder

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

Professionally installed

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

Yes

View on Justin's build

MOST POPULAR Cat Back Exhaust

Shop all Cat Back Exhaust

MFR# AP-GRBS-170T

Agency Power - Stainless Steel Cat Back

Agency Power

$1,078.00

MFR# AP-F430SC-178

Agency Power - Titanium Cat Back

Agency Power

$4,312.00

MFR# 3015-33046

AWE Tuning - Performance Exhaust w/ High-Flow Cat

AWE Tuning

$5,695.00

TOP RATED Flowmaster Exhaust

Shop all Flowmaster Exhaust

MFR# 17133

Flowmaster - American Thunder Cat Back Exhaust System

Flowmaster

$366.32

MFR# 17325

Flowmaster - American Thunder Cat Back Exhaust System

Flowmaster

$314.01

MFR# 17417

Flowmaster - American Thunder Cat Back Exhaust System

Flowmaster

$517.21