I have on my 355 high flow primary cats, no secondary cats and a quicksilver muffler. It sounds pretty good (though rather loud) at idle and part throttle but does not have a high pitched scream at high rpm. It actually seemed to get quieter when the bypass opens. I removed the muffler and opened it up today with a plasma cutter. Basically the primary inlets go into the muffler and after a short perforated section dump into an open plenum. No packing was in the muffler. Exhaust gasses basically collide head-on and can then find there way through any of the 4 outlet pipes . When the bypass valve opens it too just dumps into the common plenum. I'm guessing that noise volume does not increase due to increased turbulence. 1st drawing- stock configuration 2nd drawing. In this plan the 2 main inlets go to the common plenum head on and must find there way through 2 available outlet pipes. When the bypass valve opens exhaust is routed directly to the 2 remaining tips with straight solid pipe. I think this should quiet it down a bit during idle/cruise but make it dramatically louder when the bypass opens. 3rd picture is the same as the 2nd except there is a built in "X" pipe to help direct primary exhaust flow. I could also perforate the "X" and put muffler packing around it. Just a couple ideas. I'm certain that the bypass section will go straight to 2 tips. Just havn't decided on what I'm going to do with the primary inlets and their respective outlets. Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login
Well, I ended up putting it together like the 2nd drawing. Going to re-install tomorrow and see how it sounds. I think it should be much better now with two completely separate flow paths with the bypass section being straight through.
Should be bad ass. I can't believe the original config on that muffler. Pretty lame for a thousand plus dollar unit. A video of that bypass opening up would be pretty cool
Just fired it up with the new configuration. At idle it is -slightly- quieter than it was before. Tone is very similar at idle/part throttle as well. I was hoping it was going to be dramatically quieter at idle but this is still an improvement. Waiting for oil temp so I could rev this thing was agonizing. Oil up to temp, pedal to floor, DAMN! This thing rocks!!! Whereas before it sounded like it got quieter when the bypass valve opened now it sounds very F1. I am so excited to drive this thing now!!
Drove the car tonight. I thought it was too loud at idle but I must have thought that because it was in the garage. It's actually much quieter and idle/cruise now. I kind of miss the super loud "womp" when I blip the gas but the trade off is I can actually hear inside the car and everything isn't resonating/rattling from the noise. Now, at wide open throttle it sounds absolutely sick when the bypass valve opens. I forgot the video camera at the shop but at the very least I will take a video of it on the dyno next week. I'm curious to see if there is any power gain to go along with the sound improvement.
I recently purchased my QuickSilver SuperSport along with Fabspeed's headers & their secondary bypass delete pipe also I will be running test pipes & although I haven't even heard my QS, I'm probably going to have this done to mine as well! Thanks again James you have been so helpful & I appreciate all your insight & creative thinking. A.J.
does anyone know if the old style tubi muffler baffle design is similar to the QS design as shown by the photo at the start of this thread?
What happend to that dyno-sound test?? I´m about to do exact the same thing on my 355. I´ve cut a hole in the muffler and it looks exactly the same a your picks inside.
It made 295rwhp which is a 6hp gain at peak, and gained as much as 10hp at high rpm just before the rev limiter. As to the sound here is a vid- [ame]http://www.youtube.com/watch?v=IyzOwdPDl4s[/ame]
you mean just 295 BHP???? If QS selling such a crap for many $$$ I wonder why people stil bying that thing, to impove it themselfs!?
Here a tubi cost around $3800.00. If the tubi is as simple as this exhaust....it should only be worth $500.00 NEW. p.s. If anyone has an old or damaged tubi.......cut it open and post it here for all to see.
This post serves as a reminder to all those that pay 2-4 grand for a 'performance' muffler. What a total waste of money. It would be smarter to take your stock muffler off and cut it open/ mod it /weld it back together. If you can weld it (which I can) ....costs you nothing......if you can't ....take it to a welding or muffler shop who can.....(probably cost a couple of hundred bucks).
If I'm not mistaken, I think that this set up is the same like Tubi, I think I saw it on another thread.
I would guess that because of cats in the primaries and no cats in the secondaries you are getting wave cancelation (instead of turbulence) at certain RPMs.
Thanks for the video! Nice to hear! Do you have any pics off the result just before closing the "box"?
