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Discussion Starter · #1 ·
Hey everyone new to the forum been looking at parts for myself and a friend of mine. I know I found a downpipe some where maybe puma speed but I'm curious as to advantages and disadvantages of catted over catless apart from price.
 

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Catted is greener. High flow cat is better flow for the exhaust, good increase in power, still possibly "legal" for street use.

Gutted is for race car. Highest flow, most power production. Not street legal.
 

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Discussion Starter · #3 ·
Well yes but I live in michigan so we don't really have any emissions tests so not of high importance, but would you get more torque to horsepower on a catted dp or on a catless? More lbs and less hp from a catted or is that backwards?
 

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Discussion Starter · #4 ·
Would there be a huge difference between the two on a noise side? Reason asking my car has a test pipe and it's a noticeable difference on WOT for noise but t idle and just cruise it's not that loud
 

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We don't have emissions testing in Alberta, but it's illegal to replace emissions related equipment in Canada, for street cars. A catless down pipe is louder, and will gain more horsepower and torque on a turbo engine, though tuning would be required to maximize the benefits of increasing exhaust flow. It would be hard to guess how much without dyno-testing.


Sent via poles, wires and telegraph 2.
 

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Discussion Starter · #6 ·
Yes but is any one going to check it? Doesn't the Cobb AP have a shelf map that has a tune for a new DP. I know it's not the same car but Cobb has a shelf tune for the wrx with intake exhaust and DP just curious as to if the fiesta had a similar map or set up yet. Also there is a video of the fswerks cat back with a Cobb DP I wonder how long till that's out :D
 

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I'm not sure if Cobb has a down pipe option yet. But I'll bet they will, and it'll be shelf tune supported.


Sent via poles, wires and telegraph 2.
 

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Discussion Starter · #8 ·
Hmm should be interesting to see what they come up with. Thanks a lot for your information. Curious to see if anyone has a done a downpipe on the forum yet, I wanna see other peoples opinions on daily driving with them
 

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I expect to order a 3" catback and catted downpipe from 2J Racing this week. With any luck I will have it all installed by the end of April. I plan to visit a tuner in Buffalo for a custom tune once I have all the upgrades done (Injen intake on the way too).
 
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We will post a dyno of our catted and race (no cat) downpipe tomorrow.

Here is our catted downpipe and 3" catback dyno. I prefer 4th gear run below:


Text Blue Line Diagram Font
Auto part Vehicle Engine Car
Automotive exhaust Auto part Pipe Catalytic converter Tool accessory
Auto part Automotive exhaust Engine Exhaust system Fuel line
 

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Yes I have mine on with only a washer on each bolt to shim for now till I get back under and look at it soon now that Spring is here (at least on the calendar) lol
 
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