Brad
By cutting off the "Y" and routing a second system you get to save money at
that point in time. On the other hand you now have a use system on one side
and the new on the other ( kind of like buying one shoe lace at a time ).
The "H" or cross over pipe is a step above the pair of straight pipes running
from each side of the engine to the rear bumper. The effect of the "H"
system is best at idle to about 1,800 rpm's. The cross over pipe should be the
same diameter as the two exhaust pipes and as said, as close as possible to the
engine ( the space / gap between the engine and the transmission is most
offended used ).
The best system is the "X" system. It starts to help the engine from idle in
a manner above the "H" and continues to red-line. Please have your shop guy
ask or read the tech info on the "X" system.
Rodger & Gabby
Colo Spgs
'47 De Soto Custom w/Fluid Drive & passenger door mounted swamp cooler
'63 Le Baron w/F-Sweep trunk lid & std A/C *
'66 Le Baron w/dual A/C & reverbed AM/FM *
* with the above mentioned exhaust systems and a trailer hitch connected to
a ''70 AirStream 27' International