So is APR coming out with new downpipes?

[Mark P]

1.) Single pipe - no welds, not pieced together
2.) 2.5" pipe throughout
3.) Cat/Test Pipe section shaped for better clearence around transmission/tunnel
4.) 2nd O2 Sensor Bung relocated behind Cat (no longer requires stg 2+ sofware to avoid DTC)
5.) Larger Flex joints to maintain 2.5" flow.

[Mark P]

Previous System:


New System:

[Mark P]

Previous vs New:






ID = Inside Diameter
OD = Outside Diameter

Old APR DPs:
ID=2"
OD=2 1/8" (2.175")

New APR DPs:
ID=2 3/8" (2.375")
OD=2 1/2" (2.5")



The old bottleneck was 2". It's now 2 3/8". This is a 41% increase in cross sectional area*

* 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%
(actually, the previous version had a bottleneck in the flex joints less than 2", so this new version is actually a bigger improvement)

[Mark P]

[Mark P]

[Mark P]

[Minimization]

some hp/ft lb dynometer data, then I'm sold!



Joe

[nashRS4]

I now have them mated to the new APR cat-back (2.5") for my Stage III and the sound/fitment is topnotch.

[NickS]