Quote:
Originally Posted by RevNev
The TopGear system isn't optimised performance wise. Twin 2.5" pipes needs to collect into a 3.5" single not 3" and the Y pipe at the end with the twin tips needs to be a reversed merge collector not a tight U bend the way that's fabricated. It appears with valves closed, the exhaust exits from the RHS and exits from the LHS with valves open so effectively, it's a twin 2.5" system reduced down to a 3" single system that's flow restrictive.
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I think, respectfully, you're over analysing from a road car point of view.
A 3" single rear pipe will flow 500bhp ok, the CATs etc are more restrictive than anything else, the cooler back end of a system has a much less restrictive effect than the hotter DP end as gases have cooled, contracted and slowed by then..
And besides who drives round at WOT everywhere? Give me a great sounding car anyday over a few hp, even if that was an issue..