02-23-2015, 11:35 AM | #23 |
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so base on what i am reading (and im sorry this is my first car Im tuning) going with a 400 cattless vs 850 catted, you're only spending more to save the enviroment? performance wise, the cattless is your better bet?
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02-23-2015, 12:45 PM | #24 | |
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Obviously catless will be better for power production because theres less back pressure. Its a trade off. Is 2 or 3 more horsepower worth risking your car and a couple hundred dollars? |
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02-23-2015, 01:01 PM | #25 | |
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02-23-2015, 02:08 PM | #26 | ||
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2) As can be seen from the experiences here, the catted DPs don't offer much benefit because CELs show up. I want to know that if i buy a catted DP the CEL won't show up within the duration of ownership (i.e. 3 years). 3) The difference in more like 5-10 hp/ft-lbs. IMO, if you're going to get a downpipe might as well go all the way and go catless on the N2x. That is because the catted don't offer a guarantee of no CEL within a certain time frame and I've never heard practical/real-life of people getting hit by the EPA for DPs. Quote:
Lot of annoyances to deal with when you have a DP on a new, warrantied car though.
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02-23-2015, 02:49 PM | #27 | |
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Obviously they aren't going to be publicized. They exist to catch people breaking the law, so they want to be as far under the radar as possible. |
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03-10-2015, 10:23 AM | #28 |
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Quote from a blog i read "A catless downpipe will almost always cause a Check Engine Light without a tune to match, and whenever you’re stopped at a red light you’re going to smell that unburnt fuel. How much the smell bothers you and your passengers is a key factor to consider before making your decision. Is this your “weekend” car, or do you drive your kids and spouse around often in it?
On the other hand, a Catted Downpipe won’t smell, makes slightly less power than catless and costs more – but there’s a reason for that. Usually a catted downpipe has a 200-CPSI (Cells Per Square Inch) “Sport” Catalytic converter – and no, unless otherwise noted, none are CARB legal in California, but some catted downpipes are 49-state approved. Catalytic converters are expensive for a reason. Every catalytic converter is filled with a good bit of rare-earth metals like platinum, gold and other expensive heavy metals – this is why a few years back thieves were stealing the catalysts from Toyota 4runners due to the extremely high “scrap” value. Catted downpipes typically DO NOT cause a check engine light with the stock tune, and the catalyst keeps the car a little quieter and keeps the car from smelling like gas. Evolution Racewerks Competition Catted Downpipe for N20 like their catless system, is specifically designed for a smooth HP and torque increase across the powerband. Featuring 4″ piping as well, this catted downpipe offers a gain of +13whp and 24wtq, and its catted design offers an HP peak that’s higher up in the rev band for a more balanced downpipe. This ER downpipe doesn’t specify whether or not it can cause a CEL, so to err on the safe side we’d still advise using it with a tune – which again, you want to do anyway to reap the maximum benefit of a performance downpipe. These downpipes are available in standard finish as well as a black ceramic high heat coating for a stealthy look. Then we have this BMW N20 328i catted downpipe from Remus Exhaust. The Remus system increases power by 13whp/8wtq, but that’s quite conservative and the tradeoff is EEC-approved, so as to not cause a check engine light and features the same high standard of quality you can expect from a REMUS Exhaust system. This means you’ve got a high performance cat that works together with the stock ECM and even better with a tune (of course). Remus put together this video that shows it off better than a photo can. Last but not least is Wagner Tuning’s Catted Downpipe for BMW N20 Engines – including BMW F30 328i. This is a brand new item from Wagner Tuning and fits most late model N20 engine applications, as well as the F30. This high quality cat is a direct replacement for the OEM BMW Catalytic Converter and like the others, also features a 200CPSI sport cat. This design reduces backpressure and offers OEM-level, perfect fitment for a straightforward bolt-in installation. The gains aren’t yet well documented, but it’s reasonable to expect 10-13whp or so without a tune, and like the Remus catted downpipe, the Wagner Tuning N20 Catted Downpipe WILL NOT cause a check engine light. http://blog.**********s.com/best-bol...pipes-exhaust/ " For those without a JB4 and have another tune get a OBDLINK Scantool either Bluetooth (Android) or WiFi (iPhone). I got OBDLINk LX since it also has a free app called OBDLINK Tool (I read temps, monitor gauges etc and also read/clear codes) I also have Dash Command and Torque Pro apps. With them I can have auto-clearing codes
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03-16-2015, 07:49 PM | #29 |
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I seem to see few people withdrawing from ER DP concerning it may blow up the motor as we saw two people blew them up with ER cattless DP + JB4 map2. I am interested in getting an ER catted DP and using it with JB4 map 1 which I expect wtq up to ~320 lbs/ft. My concern is if it would be safe enough for few years.
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03-16-2015, 07:55 PM | #30 |
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03-16-2015, 08:07 PM | #31 | |
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I don't know what the JB4 is doing but if you start mixing those e85 wires and other crazy stuff something is bound to happen. I'm also going to go with catted
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03-16-2015, 08:31 PM | #32 |
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03-17-2015, 01:51 AM | #33 |
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If you can't easily find those posts, they must've been deleted. Actually one post was deleted very quickly. As far as I remember, one person was running e85 mix + JB4 map 2 + ER catless and other 91 octane + JB4 map2 + ER catless. I think they both said it happened while highway driving in D mode.
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03-17-2015, 08:01 AM | #34 | |
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03-17-2015, 12:05 PM | #35 | |
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Seems like such a no brainer for the exhaust guys. Jimbo |
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03-18-2015, 09:04 PM | #36 |
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The catless downpipe will pull a CEL every single time. The CEL is basically the car detecting if the cat is present and in working condition. Since in a catless downpipe, it is not there anymore, the car will detect it.
With ER catted downpipes, it usually does not pull a CEL light. On a small percentage of cars it will however. Due to the nature of it not working on 100% of the cars, they do not advertise that it will not pull a CEL. They cannot predict which cars will or will not pull a CEL. It is a luck of the draw deal. There is a fix to this however. For all the cars that do get a CEL, they put an o2 spacer on the secondary o2 sensor. So far, this has worked every single time. The spacer is $25 so at the worst, you will have to spend an additional $25. The catless will always outperform the catted downpipe. The catless will make from 13-18 whp and 15-20wtq. The catted downpipes is between 8-13 whp and 10-15wtq. This is what I was told by ER .. so thanks to them for clearing that
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03-21-2015, 03:26 PM | #37 |
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What is making me to hesitate to order the dp is that I have an AA exhaust and its deep bassy tone is already loud enough for my neighbors to notice whenever I start my car. I would have to switch to MPE, but paying another 1k for tiny exhaust tips isn't much convincing me to spend 2k total.
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08-09-2015, 07:23 AM | #38 | |
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08-31-2015, 09:17 AM | #39 |
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They don't always work from what I hear.. You're better off with a Flash Tune since they can do Catless CEL delete via software.
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09-04-2015, 01:24 PM | #40 | |
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09-07-2015, 10:13 PM | #41 |
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Looks like I'm going to get Exhaust soon, i have cold-start delete so maybe thats why my custom catless downpipe w/ stock exhaust is pretty quiet unless WOT.
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09-07-2015, 11:15 PM | #42 | |
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I have a 335 with catless DP and stock exhaust. I think this is the loudest i can go on a daily driver. Most of my customers / friends have catless DP + aftermarket exhausts, some of them did a muffler delete because they think car is too quiet
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09-08-2015, 10:31 PM | #43 | |
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09-08-2015, 10:33 PM | #44 |
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I think this is the best combo one can get. Full performance gains + louder exhaust without being obnoxious
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