11-29-2021, 11:13 AM | #1 |
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Catless vs. Catted Downpipes
Right now I have catless downpipes + single mid-pipe ... volume is a bit louder than I want and would like to reduce/eliminate the smell, but curious how the catted downpipes compare against catless from a power/hp standpoint.
I'm sure they produce less power, but how much and any noticeable spool/turbo response differences? Has anyone tested this and will it help with smell/volume reduction? Thanks! |
11-29-2021, 11:40 PM | #2 |
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Catless downpipes with a tune usually net about 20-30 whp and 30-50 wtq. Having either your primary or secondary cats should heavily reduce the smell. I'm running catless downpipes with stock catted midpipe and I only get a gas smell when I'm idling in my garage. Should work the same vise versa. I noticed more spool sounds after switching from stock to catless downpipes but it's definitely not as much as the increase you'd get from an aftermarket intake.
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11-30-2021, 09:13 AM | #4 | |
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You'll only start seeing a difference on advanced builds pushing 600 whp+ and its only 20 whp
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11-30-2021, 12:12 PM | #5 | |
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These are the only downpipes that don't lose horsepower when tuned as EACH cat is rated for 850 hp.
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11-30-2021, 11:39 PM | #7 |
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Still waiting for them to ship. I suspect it will take a few weeks to arrive
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12-01-2021, 08:54 AM | #8 |
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Expensive but worth it.
power, sound, no CEL. I have the AA downpipes on my G82 M4 Comp
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12-01-2021, 09:37 AM | #9 |
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12-01-2021, 09:40 AM | #10 |
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Not in California
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12-02-2021, 08:41 AM | #11 |
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F-ing CA ... do you know if it has to be fully stock to pass smog? I haven't done it in years, but I recall part of it is a visual inspection; is that what you're referring to, or is it all about the measurements coming from the exhaust?
Because with a friendly smog tech, I bet you can avoid this visual inspection. |
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12-02-2021, 08:46 AM | #12 | |
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12-02-2021, 12:47 PM | #13 | |
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The car will pass as long as they don't do the visual inspection. All monitors will be ready since these are essentially EPA legal high flow cats in the remaining 49 states.
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12-06-2021, 09:56 AM | #14 |
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My friend and i dynoed our cars this summer. Both run Bootmod stage 2 but my friend has the E30 map and catless downpipes. I run 20% torque reduction and stock downpipes.
On the Dynojet i got 498 whp and my friend got 514 so the difference is not big between stock downpipes and decatted which tells me that there is very little restriction in the stock downpipes considering my friend ran a E30 map too. There is even dynoruns that shows higher hp numbers with stock downpipes compared to catless ones. Last edited by M 4 FUN; 12-06-2021 at 10:09 AM.. |
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12-06-2021, 11:56 AM | #15 | |
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12-20-2021, 01:28 PM | #18 |
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How often do you have to pass smog?
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12-22-2021, 11:23 AM | #20 | |
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12-22-2021, 04:39 PM | #21 | |
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Starting January 1, 2019, if your vehicle is less than 4 model years old, you can pay a smog abatement fee instead of getting a smog inspection for the first 8 years that your vehicle is registered.
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12-23-2021, 10:05 PM | #22 |
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I'm waiting on my Remus axil back and resonated AA EL midpipe. I'm struggling between a ER catted DP and AR resonated cattless. I just want to limit the lawnmower sound of cattless but want as much power and turbo spool as possible. Would it make a difference if there is resonated DP and resonated midpipe? I've never seen anyone use it so I'm guessing it's a bad idea lol
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