My Account
My Garage
Shopping Cart

Shopping Cart

0 items in your Cart
View Cart
Subtotal
Track
My Order
MY GARAGE Select Vehicle
MY GARAGE

Hedman Hedders 21104 Header Reducer Gasket 3-1/2 to 2-1/2 Inch

Manufacturer

Picture for manufacturer Hedman Hedders

Part Number

21104
9 reviews
Sale Price

$37.80

In Stock (10+)

delivery box

Usually delivered within 2 days

Check out with

ApplePay
Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Hedman Hedders 21104 is a precision-engineered header reducer gasket designed to connect 3-1/2 inch header collectors to 2-1/2 inch exhaust pipes. This reducer gasket provides a leak-free transition between different diameter exhaust components, ensuring optimal exhaust flow and system performance.

Key Features:

  • Reduces from 3-1/2 inch to 2-1/2 inch diameter
  • High-temperature gasket material for durability and reliable sealing
  • Precision-cut design for proper fitment between header collectors and exhaust pipes
  • Helps eliminate exhaust leaks at reducer connections
  • Essential component for custom exhaust system installations

This reducer gasket is ideal for performance exhaust applications where headers with larger collectors need to connect to standard exhaust piping. The gasket design compensates for the diameter change while maintaining a secure, leak-free seal under high temperature and pressure conditions.

Products specifications

Bolts/Studs Included

Yes

Collector Attachment

3-bolt flange

Gasket Material

Paper

Oxygen Sensor Bung Included

No

Quantity

Sold as a pair.

Reducer Finish

Natural

Reducer Material

Steel

Reducer Outlet Diameter

2.5 in.

Finish Type

Raw

FLANGE Thickness

0.3125 In.

Prop 65

WARNING: Cancer. For more info visit www.P65Warnings.ca.gov

Material

Mild Steel

Gasket Or Seal Included

Yes

Hardware Included

Yes

Finish

Raw

Collector Size

3-1/2 in.

Collector Style

3-Bolt Gasket Style Flange

Flange Finish

Raw

Exhaust System Dia

2-1/2 in.

O2 Sensors Included

No

Contents

One Pair of Mild-Steel 3-Bolt Reducers, Gaskets, bolts, nuts & washers

Notes

3-1/2 in. 3-Bolt Flange Hedder Reducers; 2-1/2 in. Exhaust System; Mild Steel

Package Contents

One Pair (2 reducers) of Mild-Steel 3-Bolt Reducers, Gaskets, bolts, nuts & washers

Product Info

3 1/2 in. Collector to 2 1/2 in. exhaust tube size. (3-Bolt Flange), mild Steel Hedder Reducer.

Title

HEDMAN HEDDERS 3-1/2 IN. 3-BOLT FLANGE HEADER REDUCERS; 2-1/2 IN. EXHAUST SYSTEM; MILD STEEL

Ordered a THULE 9001 bike rack. Shipping was prompt as well as the best price on the web. Will be back for business!<br><br>

I spent hrs looking and researching parts and prices... Hands down Autoplicity<br> has it and at the best price you'll find!!

I searched the entire web looking for the best price on my item and found that Autoplicity beat everybody else in price & quality. Search no more!

Best price I could find on the net and super fast shipping.

Autoplicity had the best price on the VP fuel jugs, I ask if the could ship them out quickly and they did.

I ordered a new battery for my Harley. I wanted a battery that would last and be of good quality. I bought a Odyssey PC545 battery it stats stat it will last up to 8 years and is military grade. My package arrived quick and in good shape. My order number is #5600. Thanks

i was skeptical about this site but after reading the reviews and them having the lowest price i could find for my part i pulled the trigger and wasn't disappointed. fast shipping and low prices with great customer service will shop with them again if they have what im looking for.

I placed an order,18852,for a Husky Liner on June 19th and received it on June 21st. They have a great price and low cost shipping.

Quick shipping, good communication, low price, would purchase again from this company.

Share icon
Return Policy
Returns are easy at THMotorsports

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy