Towing trucks aren't always built the same; they come in shapes and sizes that truly pave the path of convenience for whatever obstacles we may throw at them. While definitely appreciated, the varying dimensions can make it hard to find aftermarket parts suitable for our hard-working machines, and mufflers are no different. But with the Flowmaster 70 Series Big Block II Muffler, you get the benefits of Flowmaster's 50 Series Big Block Muffler in a longer oval case frame that increases flow volume and sound reduction while also fitting the applications that the original block mufflers could not.

Constructed out of 16-gauge aluminized steel, the 70 Series Big Block II Mufflers utilize patented Delta Flow Technology to increase efficiency and produce a mild-stock exterior sound level with minimum interior resonance. A fully MIG-welded three chamber design is capable of accommodating a maximum exhaust volume that helps huge engines handle loads with improved power, torque, and towing acceleration. A resonant tuning chamber holds its own against interior sound levels and gives these babies the reputation as one of Flowmaster's quietest muffler systems. And with corrosion resistance coated within numerous classic colors, you can go all out knowing your system is safe from aging fall out.

The Flowmaster 70 Series Big Block II Muffler is available in different sizes with dual or single inlets and outlets. Each muffler is covered by a three-year warranty.

Flowmaster's goal has always been to be a fundamental and steadfast solution to the needs of race car aficionados. With the most modern of trends employed in their engineering, Flowmaster creates unmatched exhaust products that easily shine above any other brand. Good is never enough for the team working at Flowmaster. With more than 35 years of experience and an undying drive by their side, the company continuously improves the status quo of their performance parts through rigorous research and assessments.

A well regarded innovation from Flowmaster is their trademark, tough and laminar flow mufflers that eliminate obnoxious sound without ever compromising the engine's performances. The company institutes a mission of designing high quality exhaust products that prioritize user experience above anything else. A statement evident in their Delta Boost tuners which elevate engine prowess during turbo charged performances and their DeltaForce air intake systems that maximize late model applications.

Ranging from performance headers to quality air intake systems, Flowmaster regularly introduces innovative and unbelievable products to meet every need of every car personality. From sub-compact cars to turbo-diesel trucks, Flowmaster guarantees all the essentials to make your engine a force to be reckoned with. Durable, powerful and cost efficient, let Flowmaster's passion for engineering greatness be the conduit that unlocks your engine's full potential.

Warranty Information

Flowmaster's Lifetime Limited Warranty applies to Flowmaster stainless steel mufflers (excluding FlowFX series), all stainless steel exhaust systems (including FlowFX series), stainless steel pipes, air intake kits and oiled type filters (except cleaning kits), and other stainless steel exhaust accessories (except exhaust tips and racing products).

Three (3) Year Limited Warranty applies to Flowmaster aluminized steel mufflers, aluminized steel exhaust systems, aluminized steel pipes, exhaust tips and other non-race exhaust accessories.

Two (2) Year Limited Warranty applies to Delta Force Dry air intake filter elements.

One (1) Year Limited Warranty applies to FlowFX series mufflers, Elite Series exhaust headers and electronic components such as Delta Boost modules.

Flowmaster, Inc. ("Flowmaster") extends the following limited warranty to the original purchaser of its mufflers, exhaust systems, pipes, exhaust tips, headers and other non-race accessories (hereafter "products"), excluding catalytic converters sold under the Flowmaster brand.

Flowmaster warrants the products mentioned above against defects in materials and workmanship for the period set forth below, when they are owned by the original purchaser and remain installed on the vehicle on which they were originally installed. This warranty is void if the product was not installed properly on the vehicle, was installed on a vehicle for which it was not designed, or was removed from the vehicle on which it was originally installed and reinstalled on another vehicle. This warranty shall not apply to normal wear, including interior/exterior sound levels, cosmetic issues such as coatings and material discoloration, any product that was installed on a racing vehicle, installed improperly or contrary to Flowmaster instructions, altered, misused, repaired, damaged from an accident, collision, undercarriage road impact or debris, or willful or negligent act. Note that all "straight-through" mufflers which use sound absorbing material inside the muffler to cancel sound…will degrade over time. This degradation of sound absorbing materials is considered "normal wear"…not a material defect.

The warranty set forth herein for Flowmaster stainless steel mufflers (except FlowFX), all stainless steel exhaust systems, stainless steel pipes, stainless steel exhaust accessories (except exhaust tips) and air intake kits and oiled type filters (except cleaning kits), extends for a period of the life of the original vehicle the product was installed on. The warranty set forth herein for Flowmaster aluminized steel mufflers, aluminized steel exhaust systems, aluminized steel pipes, all exhaust tips and non-race exhaust accessories and commercial applications of aluminized steel products or stainless steel products extends for a period of three (3) years from the date of original purchase and the original vehicle it was installed on. The warranty set forth herein for Flowmaster dry air intake filter elements extends for a period of two (2) years from the date of original purchase and the original vehicle it was installed on. The warranty set forth herein for Flowmaster Exhaust headers, FlowFX mufflers, and Delta Boost modules extends for a period of one (1) year from the date of original purchase and the original vehicle it was installed on. Header warranty does not cover damages caused by exhaust insulating wrap, and is void if the product was installed on a new or rebuilt engine during the initial break-in period.

To make any claim under the terms of this limited warranty, the original purchaser MUST either return the product to the original retailer or directly to Flowmaster. If the original purchaser elects to return the product to Flowmaster directly, he or she must first contact Flowmaster and obtain a Returned Material Authorization (RMA) number. Once the RMA number is received, the original purchaser may return the product to the address provided by Flowmaster, along with the RMA number and Proof of Purchase of the covered product. The Proof of Purchase must clearly show the place of purchase, purchase price, product purchased, and date of purchase. If upon inspection by Flowmaster the product is found to be defective in material or workmanship, Flowmaster shall at its option, either exchange the product for new product with the same part number or refund the original purchase price.

This warranty is not contingent upon the purchaser's completion of the Warranty Registration Form found on the Flowmaster website. If however the purchaser completes and submits that form at the time of purchase, Flowmaster will keep that form on file which may serve as an aid in determining warranty coverage in the event of the loss of the original purchase receipt.

Flowmaster's liability is expressly limited to the replacement of the product or refund of the purchase price as described herein. Flowmaster shall have no liability for the cost of installation or removal of the defective product, the cost of labor or any additional parts required to complete the installation of the replacement product, towing or transportation costs, or return shipping costs. In no event shall Flowmaster be liable for any direct, indirect, special, incidental or consequential losses and/or damages, including but not limited to interruption of business or loss of business or loss of profit or damage to related components resulting from the use of or inability to use the product, or any breach of warranty or any defect in the product, even if Flowmaster shall have been advised of the possibility of such potential losses or damages. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you. This warranty gives you specific legal rights. You may also have other rights which may vary from state to state.

The warranties set forth herein are exclusive and unless otherwise required by applicable law no other warranties are made by Flowmaster or are authorized to be made with respect to the product.

California Residents: This product can expose you to chemicals which are known to the State of California to cause cancer or other reproductive harm. Please visit www.p65warnings.ca.gov for more information.