PapaSmurf805
Member
$90 + Shipping. 15k miles on it. All hardware present and no damage.
DDM Off Road Test Pipe
- Thread starter PapaSmurf805
- Start date
Dubbs_RS
New member
Replaces the 2nd cat.
For people interested in buying this, make sure that both sides of your 2nd cat are bolt on. This wouldn't work for me because I have a turboback where the 2nd cat is slip-fit on both ends. I know a lot of people will already know this, but just want to make sure potential buyers double check!
For people interested in buying this, make sure that both sides of your 2nd cat are bolt on. This wouldn't work for me because I have a turboback where the 2nd cat is slip-fit on both ends. I know a lot of people will already know this, but just want to make sure potential buyers double check!
PapaSmurf805
Member
Correct. Second cat.
PapaSmurf805
Member
I believe the Borla and most setups include a high flow 2nd cat in the system. You'd have to verify with Borla. This replaces that 2nd cat completely and is free flowing.
PapaSmurf805
Member
Bump - $90 shipped!
PapaSmurf805
Member
Just went back to stock. This is for the stock exhaust system.
respdoc
New member
Guess, I'm still confused. This item is meant for an exhaust system (that is otherwise) stock ?
ecohauler
New member
Stock and aftermarket exhaust systems are in multiple parts. First there is the pre-cat/downpipe, which comes off the turbo and bolts to the midpipe/flex section that runs under the engine. That midpipe in turn bolts to the secondary cat pipe, which is what this test pipe replaces. The exhaust behind the secondary is what you replace when you buy a "cat-back" exhaust. Unless otherwise noted, an exhaust system is a cat-back. This includes Borla, ZZP, etc. A "full" or "turbo-back" exhaust system would include all of the parts I've just mentioned. If I'm not mistaken, MPFab's Anaconda replaces the first three sections (so it bolts up to a cat-back and replaces the entire upper exhaust), but it is the only exception to the four-piece exhaust rule for our cars.
The main reason they are typically sold separately is that a cat-back is generally legal (with the exception of localities with noise restrictions) for street use, whereas it is against federal law to remove catalytic converters on a street vehicle. Thus, test pipes such as this one are always marketed as 'off road'.
The individual parts *— downpipe, flex pipe, cat pipe, and cat back — can be mixed and matched. The aftermarket components are designed to match up to both their respective manufacturers' other parts and the stock exhaust, and the result is that they all bolt up in the same places. For optimal results, you should match pipe diameters, but they will all bolt up to each other just fine. Since the stock cat-back is one piece, the same is not necessarily true for the individual parts of aftermarket cat-backs.
Sorry for the long-winded post. To alleviate any confusion, I just decided to make it comprehensive. If anything is still unclear, please let me know and I'll be happy to clarify. If you want to see pictures to help your understanding, most of the vendors on here have some good ones on their sites.
EDIT: ZZP's exhaust is a notable exception. They have an option to include a high-flow secondary cat, and from the pictures on their site it appears they do use a slip fitting rather than a flange that would match the OE exhaust. If you ordered ZZP's cat-back only, though, it should still bolt up to this test pipe just like it bolts to the stock cat. Basically, if you have either the factory cat pipe or a bolt-on high flow cat pipe that replaces just that section, you can use this test pipe.
The main reason they are typically sold separately is that a cat-back is generally legal (with the exception of localities with noise restrictions) for street use, whereas it is against federal law to remove catalytic converters on a street vehicle. Thus, test pipes such as this one are always marketed as 'off road'.
The individual parts *— downpipe, flex pipe, cat pipe, and cat back — can be mixed and matched. The aftermarket components are designed to match up to both their respective manufacturers' other parts and the stock exhaust, and the result is that they all bolt up in the same places. For optimal results, you should match pipe diameters, but they will all bolt up to each other just fine. Since the stock cat-back is one piece, the same is not necessarily true for the individual parts of aftermarket cat-backs.
Sorry for the long-winded post. To alleviate any confusion, I just decided to make it comprehensive. If anything is still unclear, please let me know and I'll be happy to clarify. If you want to see pictures to help your understanding, most of the vendors on here have some good ones on their sites.
EDIT: ZZP's exhaust is a notable exception. They have an option to include a high-flow secondary cat, and from the pictures on their site it appears they do use a slip fitting rather than a flange that would match the OE exhaust. If you ordered ZZP's cat-back only, though, it should still bolt up to this test pipe just like it bolts to the stock cat. Basically, if you have either the factory cat pipe or a bolt-on high flow cat pipe that replaces just that section, you can use this test pipe.
Last edited:
PapaSmurf805
Member
Still for sale. $90 shipped!
PapaSmurf805
Member
Sold.
