I have had Dyno Max on 2 Volkswagen. They work ok. There are a lot of better mufflers out there. They are good for the money as long as you do not expect to keep the car long! They last about 2 years max. They come with a lifetime warranty but what good is that as it does not include the labor and that is about 75% of the cost of a custom system. I only used them because they are included in a kit for Volkswagen (Techtonics) that are real cheap ($120) and is a simple DIY install. I would never put them in a system that I had to pay some one to put on because they just do not last. Several local muffler shops will not put them on with any warranty because of this. They are free flowing and if you only want to keep the car a short time then I am sure you will be ok. They do flow well. I would find some stainless steel to use if I were having something custom made and wanted it to last more than a year or two. Of course I live in the North East and if you live somewhere they do not salt the roads you might be ok but they seemed to rust from the inside out for me. and I like it. I was low on money when my OE exhaust was perforrated so my exhaust shop built a Dynomax system for half the price of an OE set up. At first, it was too loud, so they retrofitted a pair of high flow resonators, also from Dynomax, and the sound is perfect, not too loud but nice and deep, and it screams at WOT. The set up is a six into two into one, 2 2" pipes from the headers through the resonators into a collector with 3.5" outlet into the muffler with a 4.5" oval tip. I noticed a lot more low-end torque versus the OE exhaust. Looks great, sounds great, and better performance for $850 CDN.
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