[DeTomaso] X vs.H pipe commentary . . .

[JDeRyke at aol.com]

D. Vizard's comments on crossover pipes: says that on his dyno, any length 
between the headers up to about 6 feet gives pretty much the same 
horsepower/torque, and he also saw no real differences between an X pipe and an H 
pipe, or with various diameters. But 98% of VIzard's dyno runs are on some sort 
of smallblock Chevy, not a 351-C. Many that say it 'helps' have no dyno runs 
to verify their hip-pocket evaluations. Hopefully when Dan runs his tests 
he will also use a dB meter, since a secondary reason to run a crossover is 
for a little less exhaust noise- also never verified. I would be surprised at 
more than a 1.0 dB drop even when using a glass-pak muffler as part of the 
cross-over... A crossover pipe need not be round so a flat-oval or even a 
thin rectangular crossover could be run connecting the header collector areas 
without cutting ground clearance much, but would heat up our ZF cases 
somewhat. It's always something in our tightly packed sportscars.... J DeRyke