718 GT4/Spyder/GTS 4.0 Exhaust OAP (OPF/GPF delete)
Discussion
Has anyone on here fitted a set of OAPs to their GT4/Spyder/GTS 4.0?
I've seen clips of the Akrapovic ones and really like the sound of them, so thinking about potentially getting them in the future to go with the stock manifold and rear section, with potential of adding a rear section further down the line.
For anyone that has done it, does it make the car drone at all? Does it make it that much louder that you could get in trouble on track days? Also, do you have to get the car remapped to have them installed, or can you install them without a remap?
If anyone has any knowledge of how it affects warranty as well that would be great to know. I assume it voids warranty, but I was speaking to someone who has a system fitted on their GT4 (OAPs and Back box), and when it went back to the dealer for some work, they passed it for warranty work even with all the exhaust parts he had on it. - I will ask my dealer about this, but interested to hear peoples opinions
I've seen clips of the Akrapovic ones and really like the sound of them, so thinking about potentially getting them in the future to go with the stock manifold and rear section, with potential of adding a rear section further down the line.
For anyone that has done it, does it make the car drone at all? Does it make it that much louder that you could get in trouble on track days? Also, do you have to get the car remapped to have them installed, or can you install them without a remap?
If anyone has any knowledge of how it affects warranty as well that would be great to know. I assume it voids warranty, but I was speaking to someone who has a system fitted on their GT4 (OAPs and Back box), and when it went back to the dealer for some work, they passed it for warranty work even with all the exhaust parts he had on it. - I will ask my dealer about this, but interested to hear peoples opinions
Twinfan said:
I have a replacement rear silencer, with the standard headers and OAPs. I have not gone down the replacement OAPs route because:
1. You'll need to remap the engine. Without the sensored GPFs the exhaust is much freer flowing and you'll need to adjust the fuelling to match.
2. It probably makes the car illegal on UK roads. Removing emission control equipment will mean the car will fail an MOT. Insurers won't be too happy either I suspect.
3. Warranty isn't an on/off switch, it depends which part you claim for and whether the mods caused the problem. If your engine goes pop I suspect Porsche won't replace it if you've changed key exhaust parts.
4. If you remap the car it most likely means it can never again go into the OPC network as it will fail any diagnostic checks.
If you're happy with that then great, but I reckon you'll find most people haven't done this kind of thing to a nearly new 70k+ car under the factory warranty.
Any change to the exhaust system will bring in drone in my experience. The standard system is very clever and drops volume levels at the correct engine speeds by closing the exhaust valves and routing the gases through a very heavily silenced section, opening them again as the revs go above the "drone zone" to a straight through path. Removing the GPFs or adding a freer flowing silencer will bring the levels up and bring in unwanted resonance in the 2k-3k rev area.
For track days, my car blows the same volume as a standard car at 4k revs (~90dB) because it still has the GPFs fitted. WIthout them the car will be louder for sure as at 4k the only silencing will be coming from the catalytic converters in the headers.
I have had warranty work done on my car after being fitted with a replacement silencer, but I haven't claimed for anything engine related. I'm under no illusions that if I have an engine problem that it potentially won't be covered.
Probably not the answers you wanted, but I hope that helps
Many thanks for the info Twinfan, this is my first car with one of the OPF filters so not entirely sure how modding them works. 1. You'll need to remap the engine. Without the sensored GPFs the exhaust is much freer flowing and you'll need to adjust the fuelling to match.
2. It probably makes the car illegal on UK roads. Removing emission control equipment will mean the car will fail an MOT. Insurers won't be too happy either I suspect.
3. Warranty isn't an on/off switch, it depends which part you claim for and whether the mods caused the problem. If your engine goes pop I suspect Porsche won't replace it if you've changed key exhaust parts.
4. If you remap the car it most likely means it can never again go into the OPC network as it will fail any diagnostic checks.
If you're happy with that then great, but I reckon you'll find most people haven't done this kind of thing to a nearly new 70k+ car under the factory warranty.
Any change to the exhaust system will bring in drone in my experience. The standard system is very clever and drops volume levels at the correct engine speeds by closing the exhaust valves and routing the gases through a very heavily silenced section, opening them again as the revs go above the "drone zone" to a straight through path. Removing the GPFs or adding a freer flowing silencer will bring the levels up and bring in unwanted resonance in the 2k-3k rev area.
For track days, my car blows the same volume as a standard car at 4k revs (~90dB) because it still has the GPFs fitted. WIthout them the car will be louder for sure as at 4k the only silencing will be coming from the catalytic converters in the headers.
I have had warranty work done on my car after being fitted with a replacement silencer, but I haven't claimed for anything engine related. I'm under no illusions that if I have an engine problem that it potentially won't be covered.
Probably not the answers you wanted, but I hope that helps
Edited by Twinfan on Friday 20th May 09:11
Nothing set in stone yet, was just a thought I was having, but seems like its more trouble than its worth! I don't really want to tune the car to be honest, so looks like OAPs are off the table...
Liked the idea as was a lot "cheaper" than the many back box systems available, but looks like I'll just have to save harder for a back box system and stop being a cheap skate!
TDT said:
Quite a few people are doing this now.
There are solutions for CEL without remapping with the use of a plug-in ODB2 Code Blocker, that doesn't cost that much, and obviously conveniently reversible... so remap isn't the only route.
All the solutions have a element of drone... its just a question go how tolerant you are, how you perceive it, and how much of the rev range it occurs for...
Thanks for bringing this one up TDT. If the dealer was to ever plug the car into a computer, any idea if they can tell if the code had been previously blocked off once removed and put back to standard with code blocker removed? There are solutions for CEL without remapping with the use of a plug-in ODB2 Code Blocker, that doesn't cost that much, and obviously conveniently reversible... so remap isn't the only route.
All the solutions have a element of drone... its just a question go how tolerant you are, how you perceive it, and how much of the rev range it occurs for...
I never ended up going down this route in the end, did talk to some garages about doing it, but chose not to in the end as I thought it was more agg than it was worth if the car ever had to go back into Porsche for anything. They'd probably turn around and say that its the reason for bubbling paintwork or something ridiculous lol.
I believe that you can get some sort of code blocker instead of a remap, but the remap is the better option due to altering the way the actual exhaust system works from factory. Think the blocker thing block all codes though, so for example if you had a different error on your car, it wouldn't flash up.
I know of a fair few people that have done it, but they're not the PH type, so you wont find them here (not a dig at any of us that use this website!) Instagram would probably be your best bet on that.
I believe that you can get some sort of code blocker instead of a remap, but the remap is the better option due to altering the way the actual exhaust system works from factory. Think the blocker thing block all codes though, so for example if you had a different error on your car, it wouldn't flash up.
I know of a fair few people that have done it, but they're not the PH type, so you wont find them here (not a dig at any of us that use this website!) Instagram would probably be your best bet on that.
Edited by F12DDE on Thursday 30th November 12:33
Edited by F12DDE on Thursday 30th November 12:34
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