Anyone have a JCR exhaust fitted in the North West? - Page 1 - Boxster/Cayman - PistonHeads UK

Hi all, I'm tempted to get the JCR silenced exhaust fitted to my GT4 but I'm hesitant without have heard one in person. Does anyone in the Manchester/North West area have one fitted that I could listen to prior to pulling the trigger? I've watched Youtube video's but it's difficult to get a feel of the sound from video's.

I am in Shropshire if you are ever passing this way : I have owned two JCR systems. First toe in the water was a non-silenced race system. Although orchestral after 2 years of testing neighbour relations i plummed for the superlight valved race system. These exhausts are of the highest quality, british made and yes a little expensive. But to quote Oscar Schindler "Nice things cost money". You wont be disappointed with the noise.

Illya Kuryakin said: I am in Shropshire if you are ever passing this way : I have owned two JCR systems. First toe in the water was a non-silenced race system. Although orchestral after 2 years of testing neighbour relations i plummed for the superlight valved race system. These exhausts are of the highest quality, british made and yes a little expensive. But to quote Oscar Schindler "Nice things cost money". You wont be disappointed with the noise. Hi mate, is this the one you have? If so, I imagine you needed an ECU tune afterwards? https://jcr-developments.com/products/titanium-sup... I'm considering the Titanium Silenced Race Pipe: https://jcr-developments.com/products/titanium-val... On Youtube video's I can hear the difference between stock and JCR but it's not enough to convince me it's worth £5,500. I imagine in person it'll be a different experience and enough to convince me.

DallySingh said: Hi mate, is this the one you have? If so, I imagine you needed an ECU tune afterwards? https://jcr-developments.com/products/titanium-sup... I'm considering the Titanium Silenced Race Pipe: https://jcr-developments.com/products/titanium-val... On Youtube video's I can hear the difference between stock and JCR but it's not enough to convince me it's worth £5,500. I imagine in person it'll be a different experience and enough to convince me. I have a 2016 911 RS so its a different configuration but its a 4 litre flat six engine all the same. JCR list price is ex-VAT so adjust for the 20%. Dont skimp on tips. The OEM tips are fine until you attach them to your full titanium system. Spend the extra 1K ish and get that warm feeling.

Just be aware that reducing the silencing from stock on the Cayman/Boxster 4.0 engine will very likely introduce a level of drone/resonance between 2k and 3k revs which is not noticeable when blasting through that range at speed, but when pottering around and then adding engine load is when you would hear it. That may bother you, it may not. I've not heard a silenced and valved JCR silencer in person on the 4.0 so it may be that they've found the silver bullet and it's not noticeable, but it seems this is the area most non-OEM systems struggle with. I've got used to it on my car.

Twinfan said: Just be aware that reducing the silencing from stock on the Cayman/Boxster 4.0 engine will very likely introduce a level of drone/resonance between 2k and 3k revs which is not noticeable when blasting through that range at speed, but when pottering around and then adding engine load is when you would hear it. That may bother you, it may not. I've not heard a silenced and valved JCR silencer in person on the 4.0 so it may be that they've found the silver bullet and it's not noticeable, but it seems this is the area most non-OEM systems struggle with. I've got used to it on my car. I've heard the same thing mate and I struggle to understand what this drone sound is that everyone refers to. Another reason why I'd love to hear the JCR in person. To be honest, I already find the cabin noise a bit weird between 2000-3000rpm. I don't really know how to describe it but it just sounds weak to me. My partner described it as a hairdryer between that range and I think she nailed it haha. That being said, I haven't even clocked 100miles yet so don't know whether the sound will change after the car has been ran in. With the JCR fitted, if that sound increases with the tone remaining unchanged, I'd be concerned but I wouldn't be concerned if the sound increases and the tone changes to something a bit deeper and throatier.

Other thing of note is that that with the 718, is the exhaust valves actually open, close and then open again throughout the rev range. Which will explain why it goes quiet and 'air-rushy' the mid-range as you've mentioned. So you may need to have a look at whether or not you want to take full control of that, either by unplugging the valves (rendering button redundant) or using a valve controller(2-mode.. wouldn't pay extra for 3-mode, as the engine is not supposed to be run at high revs with valves forced closed unless you have an exhaust with big bore on both open and closed (silenced) paths). Edited by TDT on Monday 3rd April 16:28

Regardless of what exhaust button setting you're using, the exhaust valves close between 2k and 3k revs. If you have the button pressed i.e. exhaust "on" then at tickover the valves are open and the car is louder. This setting also opens the intake sound symposer system that pipes intake noise into the cabin which covers up the fact that the exhaust has gone from "loud" to "quiet" between 2k and 3k revs, which is quite sneaky yet very clever on Porsche's part! Drone/resonance is there due to the GPF filters in the over axle pipes, and it seems Porsche couldn't cure it with a silencer design. This is why I'm sceptical that any of the exhaust manufacturers have. Porsche's solution was just to make the car very quiet, which is clearly good for noise regulations too. One way you can hear the effect of reduced silencing is to unplug the vacuum valve piping on each side of the OEM silencer and go for a drive. This will mean that the valves are fixed open. If you like the sound you can just plug the lines, re-secure them and away you go. The OEM exhaust is unsilenced when the valves are open - it completely bypasses the silencing material to go through a straight pipe out. This won't change the tone of the note, but will make it louder and you'll get the drone/resonance between 2k-3k revs that I'm talking about. The benefit of a replacement silencer is that you can get mixing of the cylinder banks which isn't present on the OEM system - it's basically two 3-cylinder engines from an exhaust perspective. This is what will give a tonal change, plus increased volume to whatever degree the system has been designed for.

Twinfan said: Regardless of what exhaust button setting you're using, the exhaust valves close between 2k and 3k revs. If you have the button pressed i.e. exhaust "on" then at tickover the valves are open and the car is louder. This setting also opens the intake sound symposer system that pipes intake noise into the cabin which covers up the fact that the exhaust has gone from "loud" to "quiet" between 2k and 3k revs, which is quite sneaky yet very clever on Porsche's part! Drone/resonance is there due to the GPF filters in the over axle pipes, and it seems Porsche couldn't cure it with a silencer design. This is why I'm sceptical that any of the exhaust manufacturers have. Porsche's solution was just to make the car very quiet, which is clearly good for noise regulations too. One way you can hear the effect of reduced silencing is to unplug the vacuum valve piping on each side of the OEM silencer and go for a drive. This will mean that the valves are fixed open. If you like the sound you can just plug the lines, re-secure them and away you go. The OEM exhaust is unsilenced when the valves are open - it completely bypasses the silencing material to go through a straight pipe out. This won't change the tone of the note, but will make it louder and you'll get the drone/resonance between 2k-3k revs that I'm talking about. The benefit of a replacement silencer is that you can get mixing of the cylinder banks which isn't present on the OEM system - it's basically two 3-cylinder engines from an exhaust perspective. This is what will give a tonal change, plus increased volume to whatever degree the system has been designed for. Cheers for that info mate. I think I read somewhere on PH that you've got the Ninemeister exhaust fitted to your GT4. How are you finding that and would you say there's a big difference with the sound compared to stock? At 2000-3000rpm, does your still sound a little whiney?

DallySingh said: Cheers for that info mate. I think I read somewhere on PH that you've got the Ninemeister exhaust fitted to your GT4. How are you finding that and would you say there's a big difference with the sound compared to stock? At 2000-3000rpm, does your still sound a little whiney? Yep, I have a valved and silenced Ninemeiser silencer in inconel. Compared to stock it's a bit louder when the valves are closed, when open it's straight through just like the original. Not a massive difference to stock in volume terms, but the tone is a bit different due to the mixing of the exhaust gasses from both banks. It's hard to get that across in video clips, but you can tell the difference in person. It's a bit beefier sounding I think and a nicer tone to my ears. I'm very happy with it. Mine isn't whiney between 2k-3k revs, there's a boom or resonance you can hear due to the increased gas flow. The stock exhaust does the same if you force the valves to be open.

I have a JCR exhaust for sale if anyone is interested, just been removed from my Spyder. Totally transforms the car. Please PM if interested.