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      01-08-2010, 06:04 PM   #23
IZAGLO
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Downpipes are GREAT for freeing up power, almost 20-30hp on some cars. I had the CPE full TBE with cat on my last car. They use Random Technology cats which are very free flowing. CP-E guarantees no CEL with there catted downpipes and i never had an issue till the end when my cat malfunctioned, and they replaced it for free. Here in NJ if you want to get through inspection you must have a cat, and IMO i would never own a car without a cat for the smell of exhaust pisses me off...and in reality the free flow cat only eats up very little hp, maybe 5 at the most so, get the cat, get through inspection, changing downpipes is no easy matter. But well worth the power gains....i would do this again only if my warranty was not messed with...but keep in mind it does make the car quite a bit louder, quite a BIT!!
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      01-21-2011, 12:43 PM   #24
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Izaglo...

Thanks for the feedback on the catted dp option.

Do you think the increase in exhaust sound, even with the catted version, is due to the more efficient catalyst? Or is it the increased pipe diameter?

To me, less sound is better because I am adding an Arqray quad (Jasma version) and I live in a metro area.
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      01-21-2011, 01:02 PM   #25
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i personally would go w/ catted, people who say they dont smell must not have noses.

my last turbo car was catless w/ open wastegae (best sound in the world) but I often smelled like a used lawn mower from the exhaust gases (w/ the windows down of course)
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      07-26-2011, 01:19 PM   #26
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This is an old thread but lets continue this discussion about catted downpipes. I am sure a lot of ppl are interested in this subject since not many want to deal with the smell of cutless pipes or passing emissions inspection. A lot of companies have made great products(cutted/cutless downpipes) lately. I am interested to hear some reviews/opinions , maybe dyno results with cutted vs stock downpipes if possible.

Last edited by Groundpilot; 07-27-2011 at 11:26 AM..
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      07-26-2011, 03:00 PM   #27
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Honestly I dont think even race DP's are worth the money. I regret buying them. I never felt any difference nor did I see an ET drop or MPH increase using my VBOX. The money could be put to better use on a hooker or something.
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      07-26-2011, 04:23 PM   #28
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Quote:
Originally Posted by HPFREAK View Post
Honestly I dont think even race DP's are worth the money. I regret buying them. I never felt any difference nor did I see an ET drop or MPH increase using my VBOX. The money could be put to better use on a hooker or something.
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      07-26-2011, 05:44 PM   #29
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Catless dps were all the rage in the N54 crowds when I bought my car. I got in on the AR group buy. But really I don't think it's a mod that most should do. I'm not really sure I'd do it again and my circumstances are probably biased more for them than most (no emission checks where I live, heavily modded, etc).
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      07-26-2011, 06:51 PM   #30
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Hmm. Very interesting. Are catted downpipes worth it? Second person in a row doesnt think so. And they are talking about race pipes, not even catted. Keep it coming guys. Your opinion is very important for some of us who is undecided about this mod.
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      07-26-2011, 08:07 PM   #31
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I have a set of Raceland 2.5" that I haven't yet fit to my car. They were around $200. I am going to get Magnaflow 59956's welded in so they will be catted downpipes. It will cost a total of around $400 with welding I suspect.

Downpipes definitely have a gain in terms of raw torque and power with a tune. Without one and I doubt you will see much.
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      07-26-2011, 09:05 PM   #32
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Downpipes definitely have a gain in terms of raw torque and power with a tune. Without one and I doubt you will see much.[/QUOTE]


If you want power, catless DPs will def. help. Especially if you have other mods in your car.
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      07-27-2011, 10:28 AM   #33
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I've had both catted and catless on a Subaru. The catted will make less power (about 10-15whp) and make the exhaust note different as well (quieter). You will have no or very little turbo noise out of the exhaust itself. Also yes, it will smell a bit more as well, but even with race cats, there was still a slight smell as well.

If you are going for power, just get the catless, you won't be disappointed.

If you are worried about CEL lights, use the the fix or JB4/Procede. For N55r's the Jb4 will be out soon as well which will incorporate the fix into the piggyback.

More power/less cost for catless. Not to mention, they do exhaust emissions through your OBDII port, which if you have tuning will show it as fine and pass without issue.
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      07-28-2011, 09:43 AM   #34
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Greets from Finland fellas..

Well, I just installed my Race Catted aR's to my 135i with performance exhaust and Forge Fmint. and it was totally a car from another planet.. Now it goes sideways with a little press on the peddal and I just love it.

I don't even have mod atm cause my Forge DV's were PURE SHIT and made it go limp mode after 4000rpm. But I installed my OEM DV's and now it rocks again.

After 15.8.2011 I can post here Dyno results/pictures of:

Gains with perf exhaust and Forge Fmint with stock 0,4 bar from turbos
Gains with perf exhaust and Forge Fmint with modded 0,6 bar from turbos

Gains with perf exhaust, Forge Fmint and aR catted DP's with stock 0,4 bar from turbos
Gains with perf exhaust, Forge Fmint and aR catted DP's with max. 0,9 bar from turbos

No turbo lag ATM but in high speeds I definately can see that it's not as fast what it was with 0,6 bar from turbos (Software modded).
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      07-28-2011, 05:30 PM   #35
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i would go catless, like many have said you will get gains from catted, however they will not be near the HP gains from catless.
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      07-28-2011, 06:05 PM   #36
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Quote:
Originally Posted by HPFREAK View Post
Honestly I dont think even race DP's are worth the money. I regret buying them. I never felt any difference nor did I see an ET drop or MPH increase using my VBOX. The money could be put to better use on a hooker or something.
I'm only considering DPs because they're required for hotter tunes. I know GIAC requires it for stage 2, and don't the piggybacks also support higher boost if you have DPs?
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      07-28-2011, 07:27 PM   #37
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I have heard (from my flash tuner over here MS Tuning) that no matter what tune your car has... IF you have the stock cats (primary) - your engine will not make more than 380 PS. When you take off the primary cats... you will see right around 400 or 410 PS.

I have the N55 mid pipe for my N54... that will delet the secondary cats... I am curious as to how much that mid pipe would "wake up" the mid range response. I have yet to install them.

Normally when you remove the cats... the engine has better throttle response and power, bc the exhuast can flow more cfm's. The downside is the car will be LOUD at WOT.
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      07-28-2011, 07:43 PM   #38
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I don't see the point in spending more to go slower, then again I don't live in a state that requires emission testing. But if I did, I would still get catless downpipes and swap my oem cats prior to do the testing.
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      08-06-2011, 09:28 AM   #39
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[QUOTE=ar design;6466433]
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Can you go into more detail?
So if I buy catless downpipes I need to buy the sensors and the downpipes fix???
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      08-06-2011, 04:09 PM   #40
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catted down pipes are worth it if you care about enviorment. Unless you intend on really turning up the boost on your car, leave the stock dp in place. At higher boost levels, the heat associated with it can cause damage to your catts and leave you at risk of having them sucked into your turbo. The appreciable gain associated with gutted dp's can only really be seen with a proper tune. With that being said, I wouldn't want to be the 'test case' for exactly how much boost you can run on an after market catted pipe. Companies like Cobb Tuning run hours of worth of test to see exactly how much boost can be run on your stock pipes - I don't know of any companies that are running similar test on after market catted pipes. Either remain stock, or completely gut your pipes.
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      08-06-2011, 05:06 PM   #41
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I heard that downpipes don't make a difference on our cars..This reminds of the Evo ix and the Evo x the ix made a big difference rather then the x,it made a zero power increase nor faster spool!
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      08-06-2011, 06:38 PM   #42
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Well you heard wrong. Those oem downpipes are the biggest restriction in our exhaust system.
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      08-06-2011, 06:54 PM   #43
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Quote:
Originally Posted by RnmEvo9 View Post
Well you heard wrong. Those oem downpipes are the biggest restriction in our exhaust system.
Well heard this from 2 people yesterday and couple on this thread ..I have to do more research on this mod,but if I run .d.ps tree going to be catless!!
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      08-07-2011, 04:30 AM   #44
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I have had both the AR Design Catted and non-Catted downpipes on my car along with all my other mods at the time.

I did ZERO dyno runs with this car, so I have no hard evidence but only my opinion about the two.

From Stock to the aftermarket pipes makes a helluva difference. Second most important mod for your turbo Bimmer.

With the catted pipes, it felt as if I had a lot more torque when launching my car from a stop, and even from 40-100mph.
It was a lot quieter than the catless pipes during normal driving conditions.
It didn't have the exhaust odor of non-catted pipes.
However, even with 'racing cats,' I still ended up going to OEM downpipes in order to pass emissions. They will not pass in the state of California, unfortunately. I only passed after switching back to stock from failing the first time.


Catless "feels" like it has slightly less torque down low, but has a lot more pull up top.
You can hear the turbos scream when going WOT without resonated midpipes. (It almost sounds like a freight train)
My car shoots flames out the exhaust when shifting during WOT. (Dunno if this is common)
The pipes have a deep rumble even if running OEM cat-back exhaust.
It leaves an exhaust scent in the air but not overwhelming.



There is more but I cannot think of anything else to type.
It is 2:25am here and I am heading off to bed now.

P.S.


Anyone want to purchase AR Design Catless Downpipes (N54)?
I'm going catted with my 1M.
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