JCR exhaust arrived
#46
Burning Brakes
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Originally Posted by Rennolazine
everything is louder than oem
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#47
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#48
Burning Brakes
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Originally Posted by TTFLT6
You wouldn’t. My question. was for Jonny. He has offered decibel levels in the past.
Last edited by 808c2s; 02-13-2021 at 10:12 PM.
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TTFLT6 (02-14-2021)
#49
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There is no way that pile of broken up ceramic as seen in the dummy delete thread is good for the performance of our motors. It looks so solid with more matrix than air passages. I know from expericne that going from an OEM ceramic cat to a 200-cell HJS cat opens up the exhaust significantly. More dyno documented power and better throttle response. So now having two of these ceramic honey comb devices in our exhaust pathways doesn't seem like progress, but rather regulation driven digression.
I agree that it's extra weight and a bit of an annoying thing to have on your car but the benefits of keeping it on are real I think. The comparison of stock headers vs. Aftermarket with 200 cpi may not be entirely relevant. Those cats are very close to the heads and interfering with exhaust scavenging. The OPF is very far back where it is less of an issue. If you want to run cats, getting a setup where the cats are in place of the OPF would be a great solution. Far superior to solutions where the cat is part of the header.
Personally I'm thinking to go race headers + performance rear section but leave the stock OAP in. I've heard what a "full" system sounds like and that's just ungodly loud. The stock PSE does an amazing job with valves closed but it will always sound like 3 plus 3 cylinders and the X-piped solutions all get loud pretty fast. So I see no other way than to keep the one thing that seems to do the most to keep the sound levels down.
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sobiloff (02-14-2021)
#50
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I'm also in the market for a new rear section and having listened to sound clips from Fabspeed, JCR, Soul, Akrapovic, etc, nobody seems to come close to as good of a sound profile as JCR. Having said that, they and Akrapovic are also the most expensive, likely because they are titanium. It's difficult to justify $8000 CAD for just a rear section when sound improvement is all I'm looking for, not really weight savings. Since JCR has mentioned they aren't developing any other options for the 718 4.0L, I'm hoping another manufacturer is able to reproduce a similar sound signature with a more affordable stainless steel option.
#51
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I'm also in the market for a new rear section and having listened to sound clips from Fabspeed, JCR, Soul, Akrapovic, etc, nobody seems to come close to as good of a sound profile as JCR. Having said that, they and Akrapovic are also the most expensive, likely because they are titanium. It's difficult to justify $8000 CAD for just a rear section when sound improvement is all I'm looking for, not really weight savings. Since JCR has mentioned they aren't developing any other options for the 718 4.0L, I'm hoping another manufacturer is able to reproduce a similar sound signature with a more affordable stainless steel option.
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TTFLT6 (02-14-2021)
#52
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We're still in the early phases of modding the 4.0 platform I feel, but the data so far does not support the OAPs being major power robbers. The real world data we've seen from people with a financial interest in selling pipes has shown power gains from 0 to 5 or 6 HP. It also seems that some drone is hard to avoid when you ditch the (fake or real) OPF completely.
I agree that it's extra weight and a bit of an annoying thing to have on your car but the benefits of keeping it on are real I think. The comparison of stock headers vs. Aftermarket with 200 cpi may not be entirely relevant. Those cats are very close to the heads and interfering with exhaust scavenging. The OPF is very far back where it is less of an issue. If you want to run cats, getting a setup where the cats are in place of the OPF would be a great solution. Far superior to solutions where the cat is part of the header.
Personally I'm thinking to go race headers + performance rear section but leave the stock OAP in. I've heard what a "full" system sounds like and that's just ungodly loud. The stock PSE does an amazing job with valves closed but it will always sound like 3 plus 3 cylinders and the X-piped solutions all get loud pretty fast. So I see no other way than to keep the one thing that seems to do the most to keep the sound levels down.
I agree that it's extra weight and a bit of an annoying thing to have on your car but the benefits of keeping it on are real I think. The comparison of stock headers vs. Aftermarket with 200 cpi may not be entirely relevant. Those cats are very close to the heads and interfering with exhaust scavenging. The OPF is very far back where it is less of an issue. If you want to run cats, getting a setup where the cats are in place of the OPF would be a great solution. Far superior to solutions where the cat is part of the header.
Personally I'm thinking to go race headers + performance rear section but leave the stock OAP in. I've heard what a "full" system sounds like and that's just ungodly loud. The stock PSE does an amazing job with valves closed but it will always sound like 3 plus 3 cylinders and the X-piped solutions all get loud pretty fast. So I see no other way than to keep the one thing that seems to do the most to keep the sound levels down.
#53
#54
Intermediate
#55
#56
RL Community Team
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I'm also in the market for a new rear section and having listened to sound clips from Fabspeed, JCR, Soul, Akrapovic, etc, nobody seems to come close to as good of a sound profile as JCR. Having said that, they and Akrapovic are also the most expensive, likely because they are titanium. It's difficult to justify $8000 CAD for just a rear section when sound improvement is all I'm looking for, not really weight savings. Since JCR has mentioned they aren't developing any other options for the 718 4.0L, I'm hoping another manufacturer is able to reproduce a similar sound signature with a more affordable stainless steel option.
Don't get me wrong, this price point is not for everyone and the SS systems have their place and the advantage of lower cost however...
Personally I did not want a stainless steel system if I were moving away from the OEM parts, I figured that if I am changing out some of the exhaust system it will have to check the boxes in sound, lightweight construction and quality or for my I wouldn't bother. As you have probably figured by now I have the JCR Silenced Valved Race Pipe and Akra link-pipes and the sound is incredible, it is all Titanium and is a work of art...
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#57
Intermediate
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#58
RL Community Team
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TBH, the JCR OAP's were not available when I was ordering exhaust parts, normally I would match the system.
#59
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I'm also in the market for a new rear section and having listened to sound clips from Fabspeed, JCR, Soul, Akrapovic, etc, nobody seems to come close to as good of a sound profile as JCR. Having said that, they and Akrapovic are also the most expensive, likely because they are titanium. It's difficult to justify $8000 CAD for just a rear section when sound improvement is all I'm looking for, not really weight savings. Since JCR has mentioned they aren't developing any other options for the 718 4.0L, I'm hoping another manufacturer is able to reproduce a similar sound signature with a more affordable stainless steel option.
From what I gather from this thread (thank you all for the feedback), my ideal setup might be the JCR valved non-silenced with OEM GPF and no valve controller. The valves still close automatically under 4k rpm? If that's the case that might dumb down the downshifting sounds and will need a valve controller. The only time drone will annoy me is on the highway.
Which gives a cleaner high pitch sound? the silenced or non-silenced valved race pipe?
#60
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The Soul valved rear section is SS but it does sound very close to JCR's exhaust. I'm having a warm time deciding which one to get. JCR is what the heart wants but wallet says SOUL lol.
From what I gather from this thread (thank you all for the feedback), my ideal setup might be the JCR valved non-silenced with OEM GPF and no valve controller. The valves still close automatically under 4k rpm? If that's the case that might dumb down the downshifting sounds and will need a valve controller. The only time drone will annoy me is on the highway.
Which gives a cleaner high pitch sound? the silenced or non-silenced valved race pipe?
From what I gather from this thread (thank you all for the feedback), my ideal setup might be the JCR valved non-silenced with OEM GPF and no valve controller. The valves still close automatically under 4k rpm? If that's the case that might dumb down the downshifting sounds and will need a valve controller. The only time drone will annoy me is on the highway.
Which gives a cleaner high pitch sound? the silenced or non-silenced valved race pipe?
JC
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