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  • Flowmaster 2.5 IN(O)/OUT(D) 10 Series CROSSFLOW 409 Muffler - 8425810
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Flowmaster 2.5 IN(O)/OUT(D) 10 Series CROSSFLOW 409 Muffler - 8425810
Flowmaster 2.5 IN(O)/OUT(D) 10 Series CROSSFLOW 409 Muffler - 8425810
Flowmaster 2.5 IN(O)/OUT(D) 10 Series CROSSFLOW 409 Muffler - 8425810
Flowmaster 2.5 IN(O)/OUT(D) 10 Series CROSSFLOW 409 Muffler - 8425810
Flowmaster 2.5 IN(O)/OUT(D) 10 Series CROSSFLOW 409 Muffler - 8425810
Flowmaster 2.5 IN(O)/OUT(D) 10 Series CROSSFLOW 409 Muffler - 8425810
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Flowmaster 2.5 IN(O)/OUT(D) 10 Series CROSSFLOW 409 Muffler - 8425810

Exhaust, Mufflers & Tips Muffler
Flowmaster
flo8425810
Special order
September 23, 2026
$153.35 $192.95
Flowmaster's latest version of its popular Super 10 Series muffler is now offered in a crossflow design. This 409S Stainless Steel muffler is designed to be mounted transversely and has a 2.50 inch inlet and dual 2.50 inch outlets. Like all Super 10 Series mufflers, this single chamber design delivers a powerful and aggressive tone inside and outside of the vehicle. This muffler is backed by Flowmaster's Lifetime Limited Warranty. Universal Muffler - Some adaptation may be required. Features & Benefits Crossflow desgin for transverse mounting applications Flowmaster Chambered Technology Most Aggressive Tone Available Stainless Steel Construction Flowmaster Reliability Downloads & Resources Video File (WEBM) Warranty (PDF) Installation Instructions (PDF)
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Flowmaster 3 IN(O)/OUT(C) DELTA 40 SS Muffler - 843041
Flowmaster 3 IN(O)/OUT(C) DELTA 40 SS Muffler - 843041
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Flowmaster 2.5 IN(O)/OUT(D) 10 Series CROSSFLOW 409 Muffler - 8425810
SKU: flo8425810
Product Details

Everything You Need To Know

Review product information, shipping and returns, and price-match details before you order.

Product Info

Flowmaster's latest version of its popular Super 10 Series muffler is now offered in a crossflow design. This 409S Stainless Steel muffler is designed to be mounted transversely and has a 2.50 inch inlet and dual 2.50 inch outlets. Like all Super 10 Series mufflers, this single chamber design delivers a powerful and aggressive tone inside and outside of the vehicle. This muffler is backed by Flowmaster's Lifetime Limited Warranty.

Universal Muffler - Some adaptation may be required.

Features & Benefits

  • Crossflow desgin for transverse mounting applications
  • Flowmaster Chambered Technology
  • Most Aggressive Tone Available
  • Stainless Steel Construction
  • Flowmaster Reliability

Downloads & Resources

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Shipping on new purchases

In Stock Items:
In stock items typically ship within 1-3 business days. Most items arrive within 2 business days, but there are situations where it may take up to 5 business days.

Special Order Items:
Special order and out of stock items are product-specific and lead times can vary. Please e-mail us if you are looking for an ETA / Lead Time on a specific product. Special order orders are subject to cancellation if the vendor cannot provide any ETA.

Returns Policy

To start the return process, please e-mail sales@allianceracing.com

Include the following:
Subject "Return for Order#"
Order Number
Part Number
Reason

Returns are eligible for up to 14 days from delivery of items. Accepted refunds can take up to 7-10 business days to process. All refunds are subject to a 25% restocking fee, if opened. Customer may be responsible for return shipping. If 14 days have gone by since your item was delivered, unfortunately we can’t guarantee you a refund or exchange. We reserve the right to deny any return request, based on provided information.

Alliance Racing is not responsible for ensuring part fitment. It is the responsibility of the purchaser to ensure the parts being ordered are the correct fitment for the vehicle intended. Alliance Racing will not accept any returns for incorrect fitment after product is opened.

To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.

Shipping

To return your product, mail your product to:
Alliance Racing LLC
8810 Twin Lakes Blvd
Tampa, FL 33614

In many cases, you will be responsible for shipping costs to return your item. Shipping costs are non-refundable. If you receive a refund, the cost of shipping will be deducted from your refund.

Depending on your location, the time it may take for your exchanged product to reach you may vary.

If you are shipping an item over $100, you should consider using a trackable shipping service and/or purchasing Shipping Insurance.

To initiate a price match, please e-mail sales@allianceracing.com with the product information (SKU, URL, & Part Name) and a link to the competitors product page for us to validate the price match eligibility.

Please note that there are cases when we cannot offer a price match, but we will do everything in our power to try to match it. Some manufacturers have Pricing Policies that we have to adhere to.

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