Years ago I made these for a Vectra challenge car that was running on LPG as a marketing exercise for alternative fuels. The engine had also been built by Swindon Race Engines, but apparently the manifolds contributed an extra 20 bhp. Also it gave the car a very distinctive howling engine note, which was particularly popular with fans and sponsors Calor.
Now I'm thinking about making some inline versions for my newly acquired MV6. I would obviously have to fit some cats in the link pipes, and it looks as though all 4 lambda bosses could be moved to a suitable position either side of the cats to still give a worthwhile output to the ECU and avoid the dreaded EML warning. It looks as though there is plenty of room for each 3-1 to be fitted without having to resort to a slip on collector as pictured, which we wouldn't get away with cats fitted anyway because of potential leakage. This would only be a personal exercise because it would be far too time consuming to be commercially viable.
Probably just a pipe dream (ha, ha) but it's fun to imagine how it could sound, and the extra torque that it might generate.
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Topic: V6 Exhaust manifolds (Read 1331 times)