718 Gt4 exhaust options

718 Gt4 exhaust options

Author
Discussion

Rojibo

1,431 posts

41 months

Thursday 17th December 2020
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I doubt they can test for it, yet. I don't think getting an MOT for a car with OPF's removed will be an issue, plenty of "friendly" MOT testers out there. Morally, is it the same as removing the cats? I don't know, probably not?

Twinfan

7,517 posts

68 months

Thursday 17th December 2020
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It would have to be seen as morally wrong, surely?

Won't someone think of the children?????????!!

Rojibo

1,431 posts

41 months

Thursday 17th December 2020
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It's a grey area for me, where do you draw the line? Anyone using petrol is ultimately killing the planet, but so are these electric cars with all the rare earth mining, clearly the only solution is eco-communism and mandatory bicycles delivered as part of glorious commissars 5 year plan.. you disagree? Straight to gulag.

Sorry, seem to have wandered into NP&E.

Are those people buying older cars without OPFs literally killing children? With the standard cats they run relatively clean... I dunno. I just wish regulators would stop fussing with us.

Twinfan

7,517 posts

68 months

Thursday 17th December 2020
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I was jesting, of course wink Older cars being maintained are less of an issue than new ones being created IMHO. Modifying a new one to be more polluting is a different matter. It's certainly not something I would do.

For anyone after a bit more sound with the bonus of a few extra BHP, a silencer replacement is the way to go. There's no need to mess with GPFs and headers unless you're looking for more power via a remap too.

Rojibo

1,431 posts

41 months

Thursday 17th December 2020
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I just resent the fact that these laws are being forced upon us, despite in my view the requirement being largely unnecessary. It goes against my fundamental libertarian values. I'm not going to touch it, but the government telling me not to fuss with it, makes me want to fuss with it even more hehe

I'm basically a big child that hates being told what I can or can't do.

Xfe

179 posts

40 months

Thursday 17th December 2020
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Rojibo said:
clearly the only solution is eco-communism and mandatory bicycles delivered as part of glorious commissars 5 year plan.. you disagree? Straight to gulag.
Boris, is that you?

ScottyM4CP

32 posts

36 months

Monday 21st December 2020
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New youtube video of the Akrapovic slip-on (back box) option. Good improvement on sound I would say and the quality - as expected - looks amazing. Titanium tips look superb against the black diffuser. I've started saving already!

https://www.youtube.com/watch?v=q52Y1dnBJAI

MannyLon

1,265 posts

170 months

Monday 21st December 2020
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The Akra sounds deeper and louder. Would cause issues for track days.

Vipergreen

306 posts

193 months

Monday 1st March
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So there now seems be a few Exhaust options available.

Interested to hear if any have made a great sound improvement.

Any recommendations ?

Twinfan

7,517 posts

68 months

Monday 1st March
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There's no univerally recognised best option. Several suppliers as you say each with their own pros and cons.

Yer pays yer money and takes yer choice...

Xfe

179 posts

40 months

Monday 1st March
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Twinfan, how would you compare your 9M'd GT4 to other cars you've owned/heard?

Twinfan

7,517 posts

68 months

Monday 1st March
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It's hard to say as I've only heard my car stock and with the 9m silencer. I'm getting the updated v2 version fitted next Monday which is designed to reduce some drone the v1 had between 2k and 3k revs - my car has been the test bed for their product. These cars are very drone sensitive which is why the stock system has the valves closed between 2k-4k revs.

My car is currently running the OEM silencer but with the valves always open (due to a fault, it'll be fixed on Monday) and with regard to drone it's just about tolerable. Making the whole system louder, by reducing silencing in the final section, accentuates the drone. With that in mind, I'd be very careful which system you choose to install if drone might be an issue for you. Certainly removing the OPFs or have a non-silenced 'race' raear section is asking for trouble!

If you just want louder at lower revs, consider plugging the valve vacuum pipes or fitting a valve controller (Mannylon has done this).

From what I can gather, the JCR system has no or minimal drone and sounds good although I've not heard it personally. RSVP911 has one on his Spyder and really likes it. The downside is it's very expensive and you could argue that a titanium silencer might fatigue over time. Opinions vary on that though.

The Akrapovic silencer looks good too, but I don't know how it sounds. I suspect very good but not much louder than stock, and it's also expensive. I think you're paying for better tone over more volume with this one. The Litchfield solution also looks like it should be low drone based on the design, same with Cargraphic, but again the designs might indicate not that much change from OEM. Could be wrong though, we'd need owners to chime in.

If I was buying now those would be the options I would consider, along with 9m of course. Other options are available but they're either similar to the above or you have to buy a complete system e.g. Kline.

One final note is that your choice may depend if you're running a Spyder or a GT4. WIth the roof down on a Spyder, cabin drone becomes a non-issue so if you never drive with the roof up you may want a non-silenced race system for maximum fun.

EDIT: as compared to my old 981 GTS, my GT4 sounds nothing like it. It's lower toned, bassier and doesn't pop/burble/scream. If that's what you're after, you won't be happy with the 718. A lot of it is related to the separated rather than side-by-side exhaust exits. You can't compensate for that as it affects the way you hear the sound quite massively.

Edited by Twinfan on Monday 1st March 12:16

TDT

2,816 posts

83 months

Monday 1st March
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Think thats a balanced summary.
Experience is a great teacher.

Personally from what I've seen and experienced - I'd REALLY have to be unhappy to bother to change out the exhaust system on the 718 GT4... from inside the cabin the stock car makes a good enough noise when you're on it. As Dave says... you can't replicate a 981 gen sounds, things have changed and it's not allowed on new cars anymore.
If I really want to spend money then in the first instance then - i'd be looking at a valve controller just to open up some sound at lower revs and speeds and then if I wanted more overall - I'd be looking at something like the Cargraphic or the Akrapovic...
These systems... particularly the Akrapovic focus on embracing the 718 4.0 tone and character... rather than trying to replicate something that is already gone.

Joscal

1,403 posts

164 months

Monday 1st March
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I’m genuinely happy with the standard system on my car. I can understand why people want louder and having read and watched reviews I thought the same but after 1600 miles I’m glad I didn’t rush in as it sounds great with a guttural induction snarl that I wasn’t expecting.

This shows the standard system off quite well:
https://youtu.be/Bga-Fw5Da9c

https://youtu.be/Oht8-Ah-dy0







Edited by Joscal on Monday 1st March 13:35

TDT

2,816 posts

83 months

Monday 1st March
quotequote all
Joscal said:
I’m genuinely happy with the standard system on my car. I can understand why people want louder and having read and watched reviews I thought the same but after 1600 miles I’m glad I didn’t rush in as it sounds great with a guttural induction snarl that I wasn’t expecting.

This shows the standard system off quite well:
https://youtu.be/Bga-Fw5Da9c

https://youtu.be/Oht8-Ah-dy0
Yep I wouldn't rush either and totally agree that the induction sound is really smart and a new dynamic - I wrote about this in my first drive impressions back in Dec 2019. Here on Page 82




Edited by TDT on Monday 1st March 13:48

Twinfan

7,517 posts

68 months

Monday 1st March
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There are other advatages to the silencer swap too, such as power gains, and mine definitely gained "some" bhp with the 9m exhaust as well as an even sharper throttle response. The car feels like it breathes better with it and I can't wait to get it back. Other designs, such as the Akrapovic, claim fairly small power gains (7bhp I think) and as the silencer is more OEM-like I can understand that being the case.

It's something else to consider when choosing the right option for you.

Rojibo

1,431 posts

41 months

Monday 1st March
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TDT said:
Yep I wouldn't rush either and totally agree that the induction sound is really smart and a new dynamic - I wrote about this in my first drive impressions back in Dec 2019. Here on Page 82




Edited by TDT on Monday 1st March 13:48
Good to see that Gentian GT4 is still doing it's shift at the PEC, I hammered it around last autumn. I did ask for a car with buckets but that was the only option!

Twinfan

7,517 posts

68 months

Monday 1st March
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Rojibo said:
Good to see that Gentian GT4 is still doing it's shift at the PEC, I hammered it around last autumn. I did ask for a car with buckets but that was the only option!
I had the yellow one which is Clubsport with PCCBs...

Rojibo

1,431 posts

41 months

Monday 1st March
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Twinfan said:
I had the yellow one which is Clubsport with PCCBs...
The only yellow one they had was a 981 when I was there.

Twinfan

7,517 posts

68 months

Monday 1st March
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Interesting - I wonder if they've had to get rid of it? I think it was a pre-production car. I'm surprised they've still got the 981 model, it must be a keeper.