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I just installed valved side deletes on my 997.2 GT3 with the OEM muffler. Previously, I had an RSS center delete that I bought off of Mooty years ago. I installed the side deletes because my OEM valves were fried and I thought I'd give this setup a go. However, it turned out just way too quiet. I swear I don't even remember it being this quiet when it was all OEM, which I realize makes no sense. At the same time installed valved side deletes on my 991.2 RS and the sound is perfect. I realize the RS has the titanium muffler, but I have a hard time believing that's everything because the RS is about as loud as my (traded) 991.2 GT3 with center delete. Any suggestions on how fix this? Is side delete and center delete too bizerko? Any suggestions on lesser muffled center mufflers? Thanks in advance for your advice.
Could it be that the valves on the side delete are stuck closed? Actually not sure if that's even possible, I heard that they could only be stuck open from a bad valve or the vacuum line popping off.
Since you have a .2 RS is might be worth swapping some exhaust pieces back and forth to see if something is bad. Side delete being quieter than OEM definitely doesn't sound normal.
I just installed valved side deletes on my 997.2 GT3 with the OEM muffler. Previously, I had an RSS center delete that I bought off of Mooty years ago. I installed the side deletes because my OEM valves were fried and I thought I'd give this setup a go. However, it turned out just way too quiet. I swear I don't even remember it being this quiet when it was all OEM, which I realize makes no sense. At the same time installed valved side deletes on my 991.2 RS and the sound is perfect. I realize the RS has the titanium muffler, but I have a hard time believing that's everything because the RS is about as loud as my (traded) 991.2 GT3 with center delete. Any suggestions on how fix this? Is side delete and center delete too bizerko? Any suggestions on lesser muffled center mufflers? Thanks in advance for your advice.
I haven’t tried as many combos as some but I like you can’t believe side deletes whatever the brand is going to be quieter than stock side mufflers. I was always convinced the single biggest factor in keeping sound down was keeping the stock side mufflers in place.
My car had Fabspeed sport headers plus Fabspeed side deletes and a Fabspeed center muffler delete and it was too loud! I didn’t want to change up the whole system so I added stock side mufflers back in and it was just about perfect.
In your case you could try the Fabspeed center muffler delete. It looks like a million bucks, great quality. It has two small mufflers in line on each side halfway to the exhaust tips. Sounds the same as stock before the valves open then it barks quite nice after 4K.
Wonder if headers make a difference to all this, or if the very slight pathing differences inside the new mufflers do make a noticeable sound difference. I have M&M headers and have tried both TPC side deletes with an OEM 991.1 GT3 center muffler, and then OEM side mufflers with a Sharkwerks center delete and they sound about the same. Could also be the center delete's design, I felt that my GMG center deletes were louder than the Sharkwerks ones, although they were used on OEM 997.1 GT3 side mufflers that had valves that had gone bad (which is why I swapped to the 991.1 GT3 side mufflers I found on the forum alongside the Sharkwerks delete since I was told the Sharky was quieter by some, and that leaves me where I am today).
Could also be a memory/got-used-to-it thing perhaps, there is a lot of drone-y resonance with the valves open/valves broken at low RPM and you might have gotten used to that being there instead of being tuned out with the side valves open/shutting. I would recommend unplugging the valve controller plug and going for a drive and seeing it it "seems louder again". If it's at a volume you like, then you can either just leave it unplugged and run the valves open all the time, or get Gert's aftermarket valve controller from the Carnewal website, which is a nice and simple solution.
As for muffled centers that aren't straight deletes, Fabspeed makes a center muffler called the "mini-maxflo" and JCR just came out with one as well. Akrapovic has an expensive one as well but I'd avoid that one just because of how low it hangs. Pricey too. Gorgeous muffler though, ran that one with TPC side deletes for a while, especially when you get some high heat into it and the titanium blues naturally. I never tracked the GT3 with an Akra on it but I did on my old M3 and the resulting natural color was simply stunning to look at.
Sidenote offer: If you want to just experiment with setups, I have a set of Fabspeed mini-maxflos that I wouldn't mind selling for dumb cheap. I decided to use them as scrap metal for practicing how to polish metal to a mirror shine the old fashioned way (with WD-40 and varied sandpaper grits), and my "learning process" is embarrassingly visible on the finish/surface (I was actually doing decently on one side but then I got impatient and used the wrong grit sandpaper on the other, never use anything lower than 240-grit to polish anything, lesson definitely learned). They sell for $2,295 new, but I'd sell it for $250 (plus actual cost of shipping if you are not located in 91748 for local pick-up) if you just want to try a cheap experiment. Guess you could paint it if you decided you wanted to keep it.
Attached is what they looked like and what I mean by "learning how to polish during some free time." It was fun although physically exhausting. Lots of elbow grease. Never tried anything like that before though, learned a fair bit.
Wonder if headers make a difference to all this, or if the very slight pathing differences inside the new mufflers do make a noticeable sound difference. I have M&M headers and have tried both TPC side deletes with an OEM 991.1 GT3 center muffler, and then OEM side mufflers with a Sharkwerks center delete and they sound about the same. Could also be the center delete's design, I felt that my GMG center deletes were louder than the Sharkwerks ones, although they were used on OEM 997.1 GT3 side mufflers that had valves that had gone bad (which is why I swapped to the 991.1 GT3 side mufflers I found on the forum alongside the Sharkwerks delete since I was told the Sharky was quieter by some, and that leaves me where I am today).
Could also be a memory/got-used-to-it thing perhaps, there is a lot of drone-y resonance with the valves open/valves broken at low RPM and you might have gotten used to that being there instead of being tuned out with the side valves open/shutting. I would recommend unplugging the valve controller plug and going for a drive and seeing it it "seems louder again". If it's at a volume you like, then you can either just leave it unplugged and run the valves open all the time, or get Gert's aftermarket valve controller from the Carnewal website, which is a nice and simple solution.
As for muffled centers that aren't straight deletes, Fabspeed makes a center muffler called the "mini-maxflo" and JCR just came out with one as well. Akrapovic has an expensive one as well but I'd avoid that one just because of how low it hangs. Pricey too. Gorgeous muffler though, ran that one with TPC side deletes for a while, especially when you get some high heat into it and the titanium blues naturally. I never tracked the GT3 with an Akra on it but I did on my old M3 and the resulting natural color was simply stunning to look at.
Sidenote offer: If you want to just experiment with setups, I have a set of Fabspeed mini-maxflos that I wouldn't mind selling for dumb cheap. I decided to use them as scrap metal for practicing how to polish metal to a mirror shine the old fashioned way (with WD-40 and varied sandpaper grits), and my "learning process" is visible on the finish/surface (I was actually doing decently on one but then I got impatient and used the wrong grit sandpaper on the other, never use anything lower than 240-grit to polish anything, lesson definitely learned). They sell for $2,295 new, but I'd sell it for $250 (plus shipping if you are not located in 91748 for local pick-up) if you just want to try a cheap experiment. Guess you could paint it if you decided you wanted to keep it, not that I'd care.
Attached is what they looked like and what I mean by "learning how to polish during some free time." It was fun although physically exhausting. Lots of elbow grease. Never tried anything like that before though, learned a fair bit.
These are the Fabspeed center muffler deletes I have that I spoke of. I’m happy so far and that price is nice!
These are the Fabspeed center muffler deletes I have that I spoke of. I’m happy so far and that price is nice!
Ah nice, haha. Yeah the set I have isn't very show quality at this point since it was more used for boredom/toying around, so I can't bear to charge much for them. Thought it might be useful to someone else experimenting with exhaust setups though.
I have Fabspeed headers, TPC side deletes and the RS titanium center muffler. I can tell you that setup is significantly quieter than Sharkwerks center delete with stock headers and stock sides. Difference is like 98db vs 103db. At high rpm range the valved side deletes sound very close to stock, with more of a growl down low.
Most people that drive their car on the street seem to stick with the center muffler delete (i.e. Sharkwerks, gmg, rss, etc.) as the sound increase is significant/nice but not too loud.
I have Fabspeed headers, TPC side deletes and the RS titanium center muffler. I can tell you that setup is significantly quieter than Sharkwerks center delete with stock headers and stock sides. Difference is like 98db vs 103db. At high rpm range the valved side deletes sound very close to stock, with more of a growl down low.
Most people that drive their car on the street seem to stick with the center muffler delete (i.e. Sharkwerks, gmg, rss, etc.) as the sound increase is significant/nice but not too loud.
Here is mine:
08 with headers, valved side deletes, and stock center
11 with headers, stock sides, and SW bypass
The 11 sounds louder and angrier at all RPM's, the 08 sounds great but really comes alive above 6k with burbles and all
Wow! LateBraking, I appreciate the generous offer and I may take you up on it. Based on some videos and comments I've read, I'm going to try the RSS center delete and no mufflers first. If it's too much, then I will look at some silencers. Thanks for the feedback everyone!
I'm really surprised at how drastically different the side deletes work out between the 997.2 GT3 and the 991.2 3RS. For the later the side deletes are perfect in my mind, but the 997.2 is just waaaaay too quiet.
Here is mine:
08 with headers, valved side deletes, and stock center 11 with headers, stock sides, and SW bypass
The 11 sounds louder and angrier at all RPM's, the 08 sounds great but really comes alive above 6k with burbles and all
Do you have any sound clips with the setup you have in your 11?
Ranger42, I have some questions about the side delete setups you've run on your GT3s. Perfects I can provide some insight and also guide you in the right direction. Feel free to give me a call at your convenience at 484 883 6197
Regards,
John Gaydos
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It's all in the center ... have headers and side deletes - wanted something slightly quieter and more civilized so, swapped the SW muffler bypass for an akrapovic center muffler ... almost a little too quiet for my tastes now.
05-06-2019, 09:23 PM
Side delete: Why is it so quiet?
