Originally Posted by
rs milesy
My series 1 zetec turbo project has a 3 inch mongoose exhaust on it, but I have seen someone is making a copy of the original S1 exhaust in stainless steel, but it is not 3 inch diameter, How critical is the 3 inch exhaust when running a zetec turbo engine as I am considering replacing the mongoose with original copy stainless type.
I think that bloke makes them to order, anyway, so you could specify a 3 inch bore, surely? If not, I'm sure I read somewhere that only the downpipe needs to be 3inch and the rest of the system is fine at 2.5 upto around 350/400bhp..? Might be wrong, but that's in my head for some reason