As we stock a huge variety of exhaust parts for builders and fabricators, I thought it'd be handy to make an index here with links to our online store for different parts.

Rough guidelines for petrol engine horsepower vs tubing diameter (allow tolerance between engine types):
2" - 170 hp without restriction, 200 hp with slight top end restriction
2.25" - 210 hp without restriction, 250 hp with slight top end restriction
2.5" - 280 hp without restriction, 320 hp with slight top end restriction
3" - 400 hp without restriction, 470 hp with slight top end restriction
3.5" - 550 hp without restriction, 630 hp with slight top end restriction
4" - 720 hp without restriction, 850 hp with slight top end restriction
5" - 1100 hp without restriction, 1300 hp with slight top end restriction



Mild steel tubing, bends and silencers in 2" diameter

Stainless tubing, bends and silencers in 2" diameter

Tubing, bends and silencers in 2.25" diameter

Mild steel tubing, bends and silencers in 2.5" diameter

Stainless tubing, bends and silencers in 2.5" diameter

Mild steel tubing, bends and silencers in 3" diameter

Stainless tubing, bends and silencers in 3" diameter

Mild steel tubing, bends and silencers in 3.5" diameter

Stainless tubing, bends and silencers in 3.5" diameter

Mild steel tubing, bends and silencers in 4" diameter

Stainless tubing, bends and silencers in 4" diameter

Stainless tubing in 4.5" diameter

Mild steel tubing, bends and silencers in 5" diameter

Stainless tubing, bends and silencers in 5" diameter

Collector blanks, J-bends & other miscellaneous fab components for manifold construction etc.

Catalytic converters and converter matrixes

Exhaust flanges

Electric exhaust valves

Universal outlet tips

Stainless triple layer flexible bellows with interlock
1.5" L=100mm
1.75" L=100mm
1.75" L=200mm
2" L=100mm
2" L=200mm
2.25" L=200mm
2.5" L=100mm
2.5" L=200mm
3" L=100mm
3" L=200mm
3.5" L=200mm
4" L=200mm


If you need any ideas or recommendations, feel free to send an email to sales(a)martelius.com with a description about your fab project, and we will help you choose the right parts.