Baffle causing leaness?

[Fazafou]

With the baffle out would it not decrease the back pressure? And if the back pressure is not within a certain range would it not affect how the engine runs?
Or am I talking nonsense?

You don't want any "back pressure" at all, it's a completely misunderstood concept.


The sizes of exhausts etc are not about maintaining pressure but more to do with getting exit velocity correct.  If you put massive pipes on, it slows down the gases (think of 2 rivers with the same volume of water, a deep one will be slow running compared to a fast flowing shallow one).  If the gases can't exit quick enough it hinders the engine.  So basically the pipes need to be 'tuned' to the engine to get the most out of them.


Too small and they restrict the flow, too large and the gases can't exit fast enough.  So people put massive pipes on, suffer problems and then say "I've not got enough back pressure now".