I have a V6 and I think I have the answer for those of you who want a performance muffler that is also quiet.
I have just fitted a Dynomax UltraFlo muffler (Part No. 17278) to replace my V6’s back box. The original measured around 600(l) x 200(h) x 160(w) mm, and I replaced it with an oval UltraFlo muffler measuring 350 x 83 x 190mm. This is an absorption type muffler, that uses fibreglass packed around a perforated straight pipe. As the name suggests this allows exhaust gases to flow right on through. Their website www.dynomax.com
has an area where you can listen to “before and after” sounds of cars with these systems. From this (and the fact that the UltraFlo box was heaps smaller) I got the impression I would end up with a nice LOUD exhaust that might also free up a horse or two.
I got it fitted yesterday (along with the springs Bob) and while my girlfriend reckons it sounds different, I personally can notice NO DIFFERENCE. I feel ripped off myself as I was wanting a deeper exhaust note that would make people turn and look at what was coming down the street. I now believe that a lot of the sound is suppressed further up in the system, as there are at least 3 more boxes – cats, mufflers, whatever – between the extractors and the big rear muffler. I now will look into replacing the cat and other boxes up to the muffler with a unfettered 2” pipe, leave the UltraFlo where it is and use a resonator right at the end.
But as I said, for those people wanting a performance exhaust without the noise, this seems to be ideal.
lists no distributors in Malaysia. However, that doesn't mean there aren't any, as I have found 2 here in NZ.