12-06-2019, 06:58 PM | #45 | |
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12-06-2019, 09:40 PM | #46 | |
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12-06-2019, 10:23 PM | #47 |
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Actually, It would be cool if the OEM flap could be installed in this to kind of work like the OEM set up. Then you would have straight pipes when the valve is open.
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12-07-2019, 01:59 AM | #48 |
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I'd be curious to know what a single exit with an angled tip and a diffuser that only has one exhaust opening would look like. Might look like ass on these cars but it'd be an interesting mockup if anyone is good with photoshop lol
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12-07-2019, 03:52 AM | #50 | |
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Unfortunately, the 4 inch fartcan exit was a little too bassy, and while it sounded good, it wasn't what I was looking for. Shrinking the exit pipe to 3 inches sped up the velocity enough to get rid of the low end tones. And the smaller muffler opened the volume up to the glorious result you hear in V2. So now my car is louder when I want it without any more noticeable drone than before. Last edited by ntg44; 12-07-2019 at 05:16 AM.. |
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12-07-2019, 05:58 AM | #51 | |
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Regarding the tone - the secret isn't in the muffler, it's in the merged equal length design (obviously we all know this). Regardless, this is a raspy ass engine, and a muffler bypass will be a louder, tinnier sounding version of what you hear now. If I were to do this, I'd most likely try to fit in a small resonator before the muffler bypass. It would look weird as hell underneath the car, but then there may actually be a chance that it doesn't sound horrible. If people really want to know, I guess I could just cut off the muffler and record it for everyone haha. Much cheaper R&D than implementing it for the sake of dual exit. As for me, I have perfect tone and volume right now, so a muffler bypass just isn't something I'm personally interested in. I'm probably going to put that money into a custom single exit diffuser. We'll see. Regarding pricing - it's best to contact TopGear directly. I wouldn't mind using my car for fab & fitment, but you'd need to see if shipping is something TopGear is interested in. I'm walking a fine line right now - if I start getting involved in shipping peoples' systems, even as a good will favor, I doubt mods are going to see it that way. I'm not a vendor, and don't want to be banned because someone might think I'm starting to smell like one. |
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12-07-2019, 06:44 AM | #52 |
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Directed towards others who want to venture into this custom route:
There are multiple different options you can actually take in terms of mufflers, outlets. It's not the muffler that is making that noise (although it does impact things such as the volume of the sound), it's the equal-length pipe design before they merge , this is what sets it apart as ntg44 mentioned. You can even utilize a big muffler in the mid-section such as where the OE center resonator/crossover pipe used to be, and then merge them at an x-pipe behind the differential and mock up a quad tip system from there since there would be tons of room now. But the overall theme in order to accomplish this is equalization of the pipe lengths. There are various resonated X-pipes on the market from Magnaflow as well that can be utilized as the muffler to replace the OE muffler, that way the only part you and your fabricator would need to worry about is simply getting equal-length pipes to feed into the inlets of the resonated X-pipe, and somehow route the outlets out to a quad tip. and while I wouldn't recommend hacking up your current aftermarket exhausts, you certainly can do this as well and play with the rear section design to remove the current crossover section, add length to the passenger side to be near equal to the length of the drivers side, and then re-merge them at a new crossover section.
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Prior Car:'14 Audi S5 3.0t DSG [ APR ECU/TCU | Pullies + basic bolt-on mods | 10.861@127.90mph ] Current Car: F82 M4cs | TT-RS | On Order: i4 M50 Last edited by spool twice; 12-07-2019 at 06:54 AM.. |
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12-07-2019, 12:57 PM | #53 | |
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12-07-2019, 02:17 PM | #54 |
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ntg44
I know you removed the secondary cats, but is there a way to keep the cats and also add resonators? Also is there a way to build a dual side exhaust similar to the stock setup? I understand space is a huge constraint. Maybe something like the following setup: I've seen these because that's how a NC Miata is setup, might not be big enough though for our cars to cancel out certain tones or frequencies. I would love to go through with this, unfortunately I'm on the west coast and on the wrong side of the border. This sucks. |
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12-07-2019, 02:26 PM | #55 | |
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I'm sure there is a way to add resonators - just need to fit them within the clearances. And that muffler absolutely would work. I was able to record a pull today. I didn't realize how close to the highway I was, so there's some background tire noise, but here's the best fidelity pull I got today: |
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12-08-2019, 06:59 AM | #56 |
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so smooth! Definitely sounds more classic straight-6. I need to measure my new pipes, I have a feeling that mine is still someone off-set from being 100% equal.
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12-08-2019, 09:31 AM | #57 |
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Have you posted a video of your setup? I’m going to make this mod to my OE exhaust. Interested to know exact lengths to add after you measure your exhaust. Thank you for the detailed original post!
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12-08-2019, 10:30 AM | #58 | |
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12-08-2019, 12:44 PM | #59 | |
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Last edited by ///Mani; 12-08-2019 at 04:03 PM.. |
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12-08-2019, 01:06 PM | #60 | |
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I'm in discussions with a local custom / motorsport exhaust manufacturer about this. Going to get moving on it in the new year.. I might be first UK equal length pipe S55 owner |
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12-08-2019, 01:21 PM | #61 | ||
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12-08-2019, 05:18 PM | #63 |
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I only have prototype photos (it's not the prettiest looking thing), but I can post the pictures once I can get back on a laptop.
The basics are on my design: -Center resonator/crossover delete -Added about 14-15" to the passenger side (effective length) -Merged both pipes using a Flowmaster 815953 crossover chamber directly after the rear differential -Route the pipes exiting the crossover back into the muffler inlets. Once you get the car on ramps, you'll be able to see what I mean. I have all downpipes/midpipes intact with cats, so there are opportunities to improve upon it and deliver a higher-pitched howl by removing these. Last edited by spool twice; 12-12-2019 at 07:59 AM.. |
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12-09-2019, 02:06 AM | #64 | |
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spool_twice (the OP) has the x-pipe etc with OE rear silencer. ntg44 has the single exit car with no x-pipe. |
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12-09-2019, 06:06 AM | #65 | |
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There is a dedicated thread to this (Started by Alan I), so I don't want to de-rail this thread. But for roughly $300 USD installed, you cannot beat this mod as a low budget option. It got rid of all the nasty mid-high range rasp when on boost. It's not exactly what I'd call inspiring, but at least it's fixed. It also got rid of some of the low RPM side effects of open valves - for example, my manual shifter no longer rattles after this modification. Overall, it just makes the exhaust more pleasant and un-farty. |
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12-09-2019, 08:18 AM | #66 | |
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I have these resonators sitting in my garage, i really need to get off my ass and get them installed. |
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