325-exhaust. Twin pipe or single
Moderator: martauto
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kipsy
- E30 Zone Regular
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- Location: South wales
What's your thoughts on what performs better? Was thinking of replacing my battered current system on my rally car. Not worried about looks etc.
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Grrrmachine
- E30 Zone Wiki / Team Member
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Depends on the diameter of the pipe, surely. The diameter of each pipe in the twin-pipe system is 45mm, which gives an area of 3200 or thereabouts. So a 2.5" single pipe (63.5mm) would achieve the same area, which is what BTB used in their 6-2-1 manifold.
If you went into serious gas flow dynamics though, a single pipe has a smaller circumference than double (200mm to 280mm) meaning less surface resistance between the gas and the metalwork, so possibly a smoother flow. All depends on the quality of the system and the design of the mufflers etc.
If you went into serious gas flow dynamics though, a single pipe has a smaller circumference than double (200mm to 280mm) meaning less surface resistance between the gas and the metalwork, so possibly a smoother flow. All depends on the quality of the system and the design of the mufflers etc.
'89 325i Touring | Touring Resto Thread | In-Dash Screen install
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kipsy
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Thanks for that. It's cheaper and lighter for a single system. Don't know if they sound similar? My current scorpion twin pipe system had the centre box removed and did not have an x pipe put back in. Sounds a bit like a Porsche 
having an x piece put in next week but may get new system soon
having an x piece put in next week but may get new system soon