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Old 02-17-2017, 03:53 AM   #1
rr1santos
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downpipes

So I am looking for a downpipe and going through different websites, there is a fair amount of them out there...catted, catless, resonated, non resonated.

I definitely want to go catless (aware of CEL but shoot be remedied with spacer to my understanding).

My question is what is the big major difference in downpipe for example the CTS 3.5" for 479$ and AWE downpipe for 1300$..and better yet any of them in between.

I like the idea that CTS is 3.5" but I would like to retain the stock muffler for now as i'm going for a sleeper build for now..I do like the idea of those valved exhausts but I know that catbacks don't really add performance...just sound. I would think the only issue I would run into is the pipe size connecting to stock muffler

any tips, experiences, suggestion would help

thanks
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Old 02-17-2017, 04:06 AM   #2
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CTS will bolt right up to stock exhaust no issues while your under thee mine as well do the res delete as well from audi
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Old 02-17-2017, 04:13 AM   #3
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Quote:
Originally Posted by Chronic View Post
CTS will bolt right up to stock exhaust no issues while your under thee mine as well do the res delete as well from audi
I was actually considering that route HAHAH. does the cts 3.5" catless dp taper to 2.5" or 3"?? im curious how that will effect backpressure and what not
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Old 02-17-2017, 04:26 AM   #4
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3" have had 0 issues like the sound of it got just the right exhaust note now
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Old 02-17-2017, 04:28 AM   #5
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Quote:
Originally Posted by Chronic View Post
3" have had 0 issues like the sound of it got just the right exhaust note now
got it. I wont be stage to for a bit..i just installed the jb4 yesterday..i should expect CEL correct?
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Old 02-17-2017, 04:46 AM   #6
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Some get them and some dont
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Old 02-17-2017, 04:46 AM   #7
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Some guys put a spacer on
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Old 02-17-2017, 04:52 AM   #8
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Quote:
Originally Posted by Chronic View Post
Some guys put a spacer on
okay..is there a big performance difference between catless and a well designed catted dp?
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Old 02-17-2017, 04:57 AM   #9
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I've only ever went Catless on every Downpipe my theory is the faster the exhaust can get out with 0 restriction better for the car
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Old 02-17-2017, 05:06 AM   #10
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I've only ever went Catless on every Downpipe my theory is the faster the exhaust can get out with 0 restriction better for the car
that is the theory I've adapted..i just never throw a CEL on my 08 Miata. just worried the computer in the R will mess up if I throw one.
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Old 02-17-2017, 05:39 AM   #11
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I ran a cell with Uni 1+ till I flashed stage 2
Ran 4000km like that
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Old 02-17-2017, 07:22 PM   #12
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You will not see worthy gains from going catless compared to a high flow cat, plus the car will stink, I for one can't stand the smell, but I have been known to be picky

Spacers don't always work on these cars from my prior experience. Or they do for a while but then the light comes on a few thousand miles later. I usually recommend a downpipe like AWE Tuning's downpipe if you don't want the CEL to come on without a spacer. They guarantee it.

I do not recommend running a downpipe on these cars without the proper software to match, these cars are quite sophisticated and reference too many data points to create a desired torque model. So if one or two sensors are reading properly, the car will not reach is true potential and can even run lean in many conditions. We have seen it quite a few times.
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Old 02-17-2017, 07:45 PM   #13
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I'll leave this here.. this is what i plan to do once i flash to stage 2. Hard to beat an HPA pipe for this price. Looks sweet too.

http://streetandtracksolutions.com/p...ownpipe-no-cat
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Old 02-17-2017, 08:10 PM   #14
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Quote:
Originally Posted by Excelerate Rep View Post
You will not see worthy gains from going catless compared to a high flow cat, plus the car will stink, I for one can't stand the smell, but I have been known to be picky

Spacers don't always work on these cars from my prior experience. Or they do for a while but then the light comes on a few thousand miles later. I usually recommend a downpipe like AWE Tuning's downpipe if you don't want the CEL to come on without a spacer. They guarantee it.

I do not recommend running a downpipe on these cars without the proper software to match, these cars are quite sophisticated and reference too many data points to create a desired torque model. So if one or two sensors are reading properly, the car will not reach is true potential and can even run lean in many conditions. We have seen it quite a few times.
I really don't want smell. So which high flow cat dp is effective and cost efficient? No
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Old 02-17-2017, 10:17 PM   #15
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I very rarely smell anything but if you don't like it you can always change it out for the catted which I believe they use magnaflow high flow cat and it's an extra $100
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Old 02-17-2017, 10:42 PM   #16
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Quote:
Originally Posted by rr1santos View Post
I really don't want smell. So which high flow cat dp is effective and cost efficient? No
You're definitely going to get that smell without a cat, and even with cheaper high flow cats. Usually in this instance you aren't going to get premium results for lesser money. I wish it were that easy.
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Old 02-17-2017, 10:51 PM   #17
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Originally Posted by Excelerate Rep View Post
You're definitely going to get that smell without a cat, and even with cheaper high flow cats. Usually in this instance you aren't going to get premium results for lesser money. I wish it were that easy.
so i should be looking at awe or milltek for premium high flow cat.
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