[DeTomaso] Muffler Choices

[Daniel C Jones]

> What I'm trying to understand is if a 2 1/2 inch pipe out of a good merge
> collector is enough for 425 HP or around there.  I think it is, but I'm not
> sure.  It should le a lot better than a 2 inch pipe.

For the short length of the intermediate pipes, 2 1/2" diameter is plenty.
It's the muffler core that represents the restriction.  Ideally, you want
it to appear to the collector as a larger effective diameter than the
intermediate pipe.  With the 2 1/2" intermediate pipe, step up to a 3"
straight through core muffler like a Magnaflow.  The OBX mufflers I examined
at PIM appeared to have a smaller internal diameter, the opposite of what
you want.

Dan Jones