01-12-2024, 06:56 AM | #1 |
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Sports cats or decat ??
Hi all,
After years of avidly reading this forum, this is my first message/question I may ask the community. Owner of a 1M for the last 3 years, I only use my car on week-ends and only for street use. I immediately got rid of the stock exhaust in favor of a catback Akrapovic exhaust with valve. The sound is great but could be more present/alive. 2 options here : either catless or 200 cel sports cats DP. My mechanic would like me to go catless and tells me he never installed sports cats on a 1M (and he saw quite a few of them). Either way, I will need a ECU flash. The catless option caught my interest but I am scared of the noise and smell (+ inspection). Don't know on the other hand if the sports cats option (more pricey) will really make a drastic change regarding sound. Let me know what you think ! Thanks. David. |
01-13-2024, 12:38 PM | #2 | |
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01-13-2024, 03:41 PM | #3 |
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I agree with @PRTSB1M.
Although I have never experimented with changing the stock DPs, I found that a midpipe (Maddad, in my case) had the biggest impact on the sound. The axleback alone was not enough of a change for me but midpipe + axleback was just right. |
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01-14-2024, 10:56 AM | #4 |
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Another option may be just to go catless DP eg. Akrapovic DP , but retain stock midpipe and axleback (No CEL since you retain the secondary cats in the midpipe.)
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01-16-2024, 04:24 AM | #5 |
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Hi, thanks a lot for your answers ! PRTSB1M Yes I have the Akrapovic midpipe (Evolution exhaust line).
Considering the price of HSJ sports cats, I would not want to spend 2k for a device that won't change much (or at all) the sound in the cabin. Replacing the midpipe with a N55 or else could be a solution. In your opinion, would it change drastically the sound vs my current exhaust system ? Thanks a lot for all these info and for your help ! |
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01-16-2024, 12:08 PM | #6 | |
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I think the N55 mid-pipe might give a little more sound, but you will need the reducer flange/gasket to mate it to the larger diameter Akrapovic rear section. When I get the motivation to tear the car apart again, I will be replacing the factory downpipes and MadDad mid-pipe with Akrapovic parts. |
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01-16-2024, 01:47 PM | #7 | |
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I had an N55 midpipe before the Maddad and it was not loud enough (for me.)
I do not know what Maddad does with the resonators that replace the N54 midpipe cats but the difference in volume is very noticeable. Quote:
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01-17-2024, 02:44 PM | #8 |
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Thanks a lot for your replies. I don't know if it would make any sense to replace my Akra mid pipes with Maddad ones. The only way to improve my system would be to install catless DP with an ECU flash.
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01-18-2024, 11:55 AM | #9 |
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Do you know where I could find a Maddad midpipe by any chance ? I may give a try to that solution (instead of the Akra midpipe). Depite my Google search, I cannot find the Maddad midpipe.
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01-18-2024, 02:36 PM | #10 | |
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http://www.stromungexhaust.com/contact-us.html Found a link on the wayback machine: https://web.archive.org/web/20150324..._p/md135mp.htm Last edited by PRTSB1M; 01-18-2024 at 02:52 PM.. |
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01-19-2024, 10:05 AM | #11 | |
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https://www.1addicts.com/forums/show....php?t=1881501 https://www.1addicts.com/forums/show....php?t=1334855 https://www.1addicts.com/forums/showthread.php?t=632402 Long story short, they are no longer made but the plans still exist and with the right amount of interest (or $) the original manufacturer might be persuaded to dust off the jig. These do surface occasionally on the forum classified sections as well. |
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02-14-2024, 12:21 PM | #12 | |
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Supersprint makes a race exhaust for the 1M. https://www.ecstuning.com/b-superspr...er/046206~ssp/ I also have the akra full catback exhaust and I think it's just enough sound for me. The valve rattle annoys me at cold startup though.
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