New (redesigned) APR Exhaust
Now when you connect APR downpipes to an APR exhaust, you maintain an outside diameter of 2 1/2" and an inside diameter of 2 3/8". Previously, and in stock form, this connection was a bottleneck at 2". This is a 41% increase in cross sectional area*. If you have stock downpipes, or most any other company's downpipes, you can use the reduction piece that is included.
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The dual section of the old exhaust was 2 1/4" (OD) and the new one is 2 1/2" (OD):
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The inside diameter (ID) of the connection point to the downpipes used to be 2 5/32" and it's now 2 1/2":
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Tip Difference:
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* Inside diameter of 2" versus 2 3/8":
Cross sectional area = Pi * (Diameter/2)^2
Old/stock = Pi * (2/2)^2 = 3.14
New = Pi * (2.375/2)^2 = 4.43
% increase = (4.43-3.14)/3.14 = 41%
I have since swapped the testpipes in and have a noticeable HP improvement when
combined with APR's testpipe software program.
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