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There is no annoying boom with the Kline with open valves. If one wants annoying boom which even I couldn't tolerate, buy the BC Fabs muffler. I am not a hard guy to please. YMMV.
I saw a couple of videos by Uncle with the valves closed. Too quiet for me.
There is no annoying boom with the Kline with open valves. If one wants annoying boom which even I couldn't tolerate, buy the BC Fabs muffler. I am not a hard guy to please. YMMV.
I saw a couple of videos by Uncle with the valves closed. Too quiet for me.
+1
With valves open in override mode (tune or hardware) there can be a boom/resonance around the 2500rpm zone in the Cayman. I found this a minor annoyance on other exhaust setups I used before Kline, namely Soul muffler only, then with R-OAP + OEM muffler. With the Kline, it is really just not there.
Yeah IDK what the others are talking about... unless there's an exhaust leak somewhere and/or OEM PSE button is also being used.
Haha. I leave the PSE swtich on to get more intake sound with the Kline wide open. From what I have gathered, even with the PSE swtich on, the sound symposer doesn't even activate until 4k rpms. I kinda like that extra sound in the cabin but then, I have a Boxster and it is always driven topless. I could never turn PSE on with the BC Fabs muffler because boom became BOOM. Insane!
Took two weeks to get this from Perimeter Porsche. One of two in the US. 160 bucks plus shipping. Exhaust hanger bracket for suppressing vibration supposedly. No idea what the cylindrical thing is supposed to do. Wonder if it has a heavy spring? Without one in my Kline, there is a mild vibration.
I had the broken hanger (vibration damper) installed today and it seems to help with the vibration I was noticing with only one hanger. I guess it is an important to have both of them. I have to say that the Kline with valves open while sounding great does allow for some mild vibration when off thottle. I feel it in my hands. Either that or I am developing some neurological disease. Everything is aligned well, nothing loose and nothing rubbing or touching the heat shield. I don't remember if the OEM was that way or the BC Fabs after that.
@subwoofer vibrations felt with your hands on the steering wheel generally come from the front end. (Tires wheels etc.) If the vibration is coming from the rear, you should feel it through the seat. Vibrations from the rear will sometimes make the passenger headrest shake which you can see or feel if you rest you hand on it lightly. This will be most noticeable without a passenger.
When you say off throttle, is that coasting as if you are in neutral or hard decel, as in downshifting with no throttle applied? If it is coasting and the drive train is not providing resistance then I doubt what you are feeling is coming from the exhaust, engine or trans.
What speed do you feel the vibration? Does it still happen with the car in neutral or engine turned off? Be careful turning the engine off when driving as it will negatively affect the power steering and power brakes. (general CYA, don't do this if you aren't familiar with what will happen.)
I had the broken hanger (vibration damper) installed today and it seems to help with the vibration I was noticing with only one hanger. I guess it is an important to have both of them. I have to say that the Kline with valves open while sounding great does allow for some mild vibration when off thottle. I feel it in my hands. Either that or I am developing some neurological disease. Everything is aligned well, nothing loose and nothing rubbing or touching the heat shield. I don't remember if the OEM was that way or the BC Fabs after that.
I had really bad vibrations when I installed the Soul muffler in early days pre-Kline. The vibes were in pedals, steering. It was terrible and returned the muffler for refund. It was a fitment issue where the gap between the muffler box was touching the heatshielding on the inner rear bumper. The issue would only happen once the system heated up after few minutes of driving.
@subwoofer vibrations felt with your hands on the steering wheel generally come from the front end. (Tires wheels etc.) If the vibration is coming from the rear, you should feel it through the seat. Vibrations from the rear will sometimes make the passenger headrest shake which you can see or feel if you rest you hand on it lightly. This will be most noticeable without a passenger.
When you say off throttle, is that coasting as if you are in neutral or hard decel, as in downshifting with no throttle applied? If it is coasting and the drive train is not providing resistance then I doubt what you are feeling is coming from the exhaust, engine or trans.
What speed do you feel the vibration? Does it still happen with the car in neutral or engine turned off? Be careful turning the engine off when driving as it will negatively affect the power steering and power brakes. (general CYA, don't do this if you aren't familiar with what will happen.)
Perhaps I am just adjusting to the low rpm rowdy behavior of the exhaust. Without the one hanger, I felt it in the steering, pedals and seat both on throttle and while coasting. I noticed it more at lower rpms. With both hangers, it seems to be alleviated but similar scenarios. It is really mild. I would say even milder than a vibrating phone. Nothing as bad as a vibrating passenger seat.
I don’t notice it when I am at a stop and I am in neutral. I think it is just that this exhaust doesn’t have everything buttoned down like the OEM. I have to try connecting the vacuum lines to see if that suppresses it. Shop installed it pretty well.
Perhaps I am just adjusting to the low rpm rowdy behavior of the exhaust. Without the one hanger, I felt it in the steering, pedals and seat both on throttle and while coasting. I noticed it more at lower rpms. With both hangers, it seems to be alleviated but similar scenarios. It is really mild. I would say even milder than a vibrating phone. Nothing as bad as a vibrating passenger seat.
I don’t notice it when I am at a stop and I am in neutral. I think it is just that this exhaust doesn’t have everything buttoned down like the OEM. I have to try connecting the vacuum lines to see if that suppresses it. Shop installed it pretty well.
Probably but I thought I would throw it out there. Porsche is very particular about vibration, suppressing it and resonance. NVH mitigation. Once one gets an aftermarket exhaust, you lose some of that but of course gain with a more vibrant (not vibrating) sound. Hahaha
I had been using my Kline stainless steel exhaust in my Boxster 25 with the vacuum lines disconnected. Today, I had the shop connect up the lines and went for a drive. It was really quiet below 4k rpms. I could barely hear anything except for a distant hum and some muffled pops and crackles. Above 4k rpms, the exhaust suddenly came alive which made it sound jarring. Went straight back to the shop and had them disconnect the vacuum lines and the car is back to its rowdy self. I can see where quiet may be useful in congested residential areas or perhaps for a quiet long drive on the highway. Since my car is primarily for entertainment, I see no value to the quiet mode at all but I guess a valve controller may be useful in certain instances. End of experiment.
07-08-2024, 06:36 PM
