Exhaust› Mufflers and Resonators

Flowmaster

70 Series Big Block II Muffler, 2.50" Offset

$281.95

SKU: FLO52573

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The Flowmaster 70 Series Big Block II muffler is a chambered muffler designed for a mild exterior exhaust tone. It features a 2.50 inch offset inlet and a 2.50 inch offset outlet, with an oval body measuring 22 x 10 x 5 inches. This muffler is constructed from 16 gauge aluminized steel and finished with high-temperature paint. It is a universal fit product recommended for trucks, SUVs, RVs, tow vehicles, and high-performance street cars.
Show original supplier description
The Flowmaster 70 Series Big Block II muffler is engineered for a mild exterior exhaust tone with minimal interior resonance, making it ideal for vehicles where a refined sound is desired. Its enlarged case, combined with Flowmaster's patented Delta Flow technology, contributes to improved sound control, potential mileage gains, and enhanced power. This muffler is constructed from durable 16-gauge aluminized steel, fully MIG welded for maximum longevity, and finished with high-temperature black paint. Featuring a 2.50 inch offset inlet and a 2.50 inch offset outlet, the muffler has an oval body with dimensions of 5 inches x 10 inches x 22 inches, and an overall length of 28 inches. This muffler is designed as a universal fit, suitable for a wide range of applications including trucks, SUVs, RVs, tow vehicles, and classic muscle cars.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandFlowmaster
Part NumberFLO52573
CategoryExhaust
5,000+ Trusted brands
1M+ Enthusiasts
5M+ Parts sold
(760) 282-4645 hello@motormia.co

Buy with Confidence

Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

View Full Return Policy

Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

View Full Shipping Policy