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Flowmaster 817654 American Thunder Exhaust Kit, 1967-72 GM Pickup
Flowmaster 817654 American Thunder Exhaust Kit, 1967-72 GM Pickup

Flowmaster 817654 American Thunder Exhaust Kit, 1967-72 GM Pickup

67-72 Chevy C10 Pickup, 67-72 GMC C15/C1500 Pickup, 2.5" Tube O.D., Stainless Steel

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Flowmaster 817654 American Thunder Exhaust Kit, 1967-72 GM Pickup
Flowmaster 817654 American Thunder Exhaust Kit, 1967-72 GM Pickup
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We estimate this item will ship on or before July 24th.
Part # 378817654
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Important Messages:

  • This item ships directly from the manufacturer. It may take an additional 2 business days for Flowmaster to ship this item.
  • Get FREE shipping when your order includes this item and exceeds $99! Ground shipping only in the contiguous US.
  • This item ships via Ground Shipping only. Expedited and Air shipping options are not available.


Tube O.D.:
Material Type:
Stainless Steel
Outlet Location:
Dual Rear
Outlet Size:
MFG. Part #:
GTIN Code:
Heat Shield:
Muffler Quantity:
Muffler Series:
Super 44 Series
Single or Dual:
Sound Level:
Moderate/Aggressive Sound
Exhaust System Type:
Header-back System


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 manufactured in the USA and is covered by Flowmaster's Lifetime Limited Warranty.

  • Stainless Steel Construction
  • Multiple Tailpipe Exit Options
  • Patented Delta Flow Technology
  • Lifetime Limited Warranty

Installation Instructions (PDF)


1967-1968 GMC C15/C1500 Pickup 327 CID/5.3L V8
1967-1969 Chevrolet C10 Pickup 327 CID/5.3L V8
1968-1972 Chevrolet C10 Pickup 307 CID/5.0L V8
1969-1972 Chevrolet C10 Pickup 350 CID/5.7L V8
1968-1972 GMC C15/C1500 Pickup 307 CID/5.0L V8
1969-1972 GMC C15/C1500 Pickup 350 CID/5.7L V8
1967 Chevrolet C10 Pickup 4.6L V8
1967 GMC C15/C1500 Pickup 305 CID/5.0L V6


Fits 1967 to 1972 Shortbed/Longbed GMC and Chevrolet C10 and C15 1/2 Ton 2 wheel drive pickups with a V8 engine using the coil spring suspension only
Some parts are not legal for use in California or other states with similar laws/regulations

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