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As equally as important as sound and muffler design would be a standard ecm tune based on system flow.
From a manufacturing standpoint build it to the toughest standard in one configuration is easiest, rather than build to each nation/region.
This makes sense . . . but now I am perplexed by this whole E.U. vs U.S. sound difference 'thing.' Given the explanations provided, I cannot imagine how a 'coating' over the ceramic/fiberglass could possible alter/muffle exhaust acoustics?
Avera
This makes sense . . . but now I am perplexed by this whole E.U. vs U.S. sound difference 'thing.' Given the explanations provided, I cannot imagine how a 'coating' over the ceramic/fiberglass could possible alter/muffle exhaust acoustics?
Avera
The coating doesn't change the sound, the comment regarding sound was that both the EU and NA GPF pipes have the same ceramic matrix and therefore sound characteristics.
The coating doesn't change the sound, the comment regarding sound was that both the EU and NA GPF pipes have the same ceramic matrix and therefore sound characteristics.
Yep, I am onboard with what you and @TXshaggy have shared . . . based on what you have each shared, it makes perfect sense to me that the EU and NA exhausts would sound exactly the same.
The part I find perplexing . . . how this notion that EU vehicles sound 'quieter' or 'muted' because of the GPF has not only been propagated, but is ubiquitous throughout Porsche and BMW forums, YT, etc???
I think it’s great that people are still doing this.
Little update, I helped a new friend swap his Akra OAPs for my gutted OAPs last week (AutoX issue, tho still not 100% legal) and we both concluded there was no audible sound difference to our ears.
Done with mine, took about 4hrs. Helper came in handy to help line them back up when putting them back on. I dropped the center diffuser, used a hockey puck on the brace and lifted the rear, removed tires, removed filters. Had a stud on the header side on each side of the car come out with the nut, just screwed it back in when re-assemble. Test drove it, went up to 6k since I am still breaking it in. I have the valve controller and with the valves closed, no difference between stock and gutted. Valves open it is about .5 times louder, not 2 times louder more like 1.5 times. I didn't hear any drone. Didn't change the tone, just more volume which is as expected. It is far from being too loud, I was worried because I am not in the market for a screaming exhaust. Downshifts with auto blip are so much better now. I am keeping this car for a very long time so I dont care about returning to stock so if that is the case I would recommend this mod, it was worth the time and effort. Had the car a week, wish I have done it sooner and was pissed that I had to do this mod because it should sound like this from Porsche. Sad days.
- Could tying open the PSE permanently be causing a loss in torque in the low to mid-range? I know it is normally closed at lower RPM, hence the reason people tie them open to gain more sound, and maybe it is done to improve backpressure/torque? Just a thought...
11-04-2022 | 01:53 PM
