Ok so Im trying to get one of these bad boys but cant decide which one and plus can someone explain what each of these do? thanks

ATLP HFC
ATLP Test pipe
RV-6 PCD

 

ATLP HFC goes in place of your third cat.
ATLP test goes in place of your third cat.
RV-6 PCD takes the place of your primary cats.

research, google, read about the products. info is out there.

 

so do you want to keep a third cat just make it flow better get a hfc, if you want to get ridof the 3rd cat get the test pipe . if i was you id research the pcd a bit more there not really for everyone some people dont like the rasp/smell

 

If you can deal with the smell, I would go for the PCD. But chances are you'll want a resonator, which is cheap, but still an extra little step nonetheless. Haven't heard too many complaints from HFC owners about rasp/drone. But like 6spd said, do you want to keep your 3rd cat?

 

I suggest you forget all three of those products and just get a jpipe.

I have the RV6 V3 jpipe and it gets rid of the 3rd cat.
DEF. BEST BANG FOR THE BUCK

 

The j-pipe with third cat delete is the best bang for your buck although I'd recommend our XLR8 V2 j-pipe

http://store.excelerateperformance.c.../i-494454.aspx