Important Update on US Tariffs and Pricing DETAILS ]

855.444.6872 Contact Us Mon-Sat 10a-6p
DRIVEN BY CARE

Flowmaster American Thunder Crossmember-Back Exhaust System 17655-FM

Flowmaster American Thunder Crossmember-Back Exhaust System 17655-FM
Flowmaster American Thunder Crossmember-Back Exhaust System 17655-FMFlowmaster American Thunder Crossmember-Back Exhaust System 17655-FMFlowmaster American Thunder Crossmember-Back Exhaust System 17655-FM
$1,408.99 ea
NEWARRIVING SOONEstimated Ship Date 05/20/2025 (If Ordered Today)14 Available from HOLLEY PERFORMANCE PRODUCTS as of 04/30/2025
Model: 4005022
Select a Vehicle or refer to the Vehicle Fitment Tab below to verify that this part fits your vehicle.
OVERSIZE 3
STORE PICKUP
[More Info]
The American Thunder Crossmember-Back exhaust system for 1965-1968 Chevrolet Impala and Caprice is perfect for the person looking for a moderate to aggressive sound level inside and outside of the car, with all of the performance benefits that you would expect from Flowmaster. This bolt-on exhaust system features mandrel-bent 2.50-inch aluminized steel tubing with a built-in H-pipe crossover, a pair of Super 40 Series mufflers and dual 2.50-inch mandrel bent tailpipes. The system is finished off with a pair of polished oval stainless steel tips. The system is covered by our 3-year Limited Warranty and is designed for an easy fit. The system includes all necessary parts and hardware for installation. Note: Fits coupes, wagons, and convertibles. Big Block cars, use Flowmaster# 81075 manifold down-pipe kit to connect to factory manifolds.
Features:
  • H-pipe Crossover for Maximum Power and Deep Tone
  • Super 40 Series Mufflers for Deep Powerful Sound
  • Includes Large Polished Stainless Steel Oval Tips
  • Mandrel-bent 16-gauge Aluminized Steel Tubing
  • Includes Hangers and Hardware for Installation
  • Moderate to Aggressive Exterior Exhaust Tone
  • Crossmember-back True Dual Exhaust System
  • Does Not Include Header Reducers or Downpipes for Factory Manifolds
  • For Factory Manifolds use Downpipe Kit # 81075
"Due to possible differences in the frame design during these years, modification of the muffler frame hangers may be needed.
Installation Notes:
"Due to possible differences in the frame design during these years, modification of the muffler frame hangers may be needed.
About Flowmaster

Manufacturer of performance exhaust systems, mufflers, performance 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. Since 1983, Flowmaster is the company you can trust, and has led the industry in offering only the best products you can buy for your vehicles.

Downloads:

Download Name File Size
fm_warranty_general.pdf88.58KB
17655.pdf224.09KB

Vehicle Fitment:

The Vehicle Fitment Guide is to be used as a general reference. The data has been provided by our suppliers and manufacturers and may contain errors or incorrect data. Always refer to a professional to verify correct fitment for your vehicle.
Make Model Submodel Years Engine
Chevrolet Caprice Base 1966 7.0L / 427 / V8
4.6L / 283 / V8
5.3L / 327 / V8
6.5L / 396 / V8
Chevrolet Caprice Base 1967 7.0L / 427 / V8
4.6L / 283 / V8
5.3L / 327 / V8
6.5L / 396 / V8
Chevrolet Caprice Base 1968 5.0L / 307 / V8
7.0L / 427 / V8
5.3L / 327 / V8
6.5L / 396 / V8
5.4L / 327 / V8
Chevrolet Impala Base 1965 6.5L / 396 / V8
6.7L / 409 / V8
5.3L / 327 / V8
4.6L / 283 / V8
Chevrolet Impala Base 1966 6.5L / 396 / V8
7.0L / 427 / V8
5.3L / 327 / V8
4.6L / 283 / V8
Chevrolet Impala Base 1967 6.5L / 396 / V8
7.0L / 427 / V8
5.3L / 327 / V8
4.6L / 283 / V8
Chevrolet Impala Base 1968 6.5L / 396 / V8
7.0L / 427 / V8
5.4L / 327 / V8
5.0L / 307 / V8
5.3L / 327 / V8
Chevrolet Impala SS 1965 5.4L / 327 / V8
6.5L / 396 / V8
6.7L / 409 / V8
Chevrolet Impala SS 1966 7.0L / 427 / V8
4.6L / 283 / V8
5.4L / 327 / V8
6.5L / 396 / V8
Chevrolet Impala SS 1967 7.0L / 427 / V8
4.6L / 283 / V8
5.4L / 327 / V8
6.5L / 396 / V8

Specifications:

2WD/4WD RWD
California Proposition 65 Chemical Name Chromium (hexavalent compounds), Nickel (Metallic)
California Proposition 65 Required Yes
Catalytic Converter Included No
Color Black
Emission Code 5
Exhaust Series American Thunder
Exit Position Dual Out Rear
Heat Shield No
Inlet Diameter (in) 2.5
Material Aluminized Steel
Mount Type Flanged
Muffler Part Number Kit Only
Muffler Quantity 2
Muffler Series Super 40 Series
Muffler Type Welded Baffle
Outlet Diameter (in) 2.5
Part Type Exhaust System Kit
Product Type Exhaust System
Proposition 65 www.P65Warnings.ca.gov
Shape Oval
Single Dual Dual
Sound Level Aggressive / Moderate
System Type Crossmember-back
Tubing Diameter (in) 2.5
Warranty Limited Lifetime (Lifetime)

Reviews:

Write a Review
* Your Name:
* Email (This will not be displayed)
* Rating:
Comments:

Ask a question about

Flowmaster American Thunder Crossmember-Back Exhaust System 17655-FM: