Hedman Hedders
Manufactures headers (performance exhaust manifolds) and mufflers, tubular exhaust manifold systems and street rod headers.
http://www.hedman.com/

Exhausts by Design
Exhausts by Design specialise in Performance and Custom Exhaust Systems, Manifolds and Tailpipes for Motorsport, Custom, Classic, Veteran and Vintage, Off-Road, 4x4, Kit cars, motorcycles, etc.
http://web.ukonline.co.uk/grahamf/index.htm

Powerline Components
PC Industries provides new, used and remanufactured Detroit Diesel, Cummins and Perkins diesel engines, replacement parts, OEM parts, used parts, reman subassemblies, cores and other accessories.
http://www.powerlinecomponents.com/

Indoshell Mould Ltd.
India. Produces variety of shell moulded grey and ductile iron castings, with some focus on motorcycle market. Products include cylinder blocks, exhaust manifolds, clutch discs, brake drums, and water pump bodies and impellers.
http://www.indoshellfoundry.com

Wescast Industries Inc.
Manufactures and supplies exhaust manifolds for passenger cars and light trucks and manufactures steel pump equipment parts for the petrochemical, pollution control and food processing industries. (Nasdaq: WCST).
http://www.wescast.com/

Alberta Custom Tee Ltd.
Alberta Custom Tee Ltd. is a manufacturer of copper manifolds and headers used in both hydronic heating and potable water distribution. A wide variety of copper to copper and pex to copper manifolds in stock. Custom Manifolds made to order. 3/4inch to 6inch bodies with 1/2inch to 6inch outlets available.
http://www.customtee.com/

Metcalf Marine Exhaust, Inc.
Welcome to Metcalf Marine Exhaust Inc and MMX Service Corp. Web Page, Designer & manufacturer a wide variety of marine exhaust products. All in one place for your convenience: High Quality products, Service Team, Marine repair, specializing in stainless steel custom exhaust systems and parts.
http://www.mmxhaust.com

Jet-Hot
JET-HOT The Hottest Header Coatings!
http://www.jet-hot.com/

Exhaust Productions Inc.
rush slip on mufflers, slip on mufflers, slip on motorcycle mufflers,rush motorcycle mufflers,rush mufflers,motorcycle mufflers,high performance mufflers,EPI, Exhaust Productions
http://www.epiflex.com/

Global Exhaust Technology A/S
Expertise in the area of exhaust systems (mufflers, catalysts, and particulate filters).
http://www.glextech.com/