| So I can only speak for those (and the OEM repl exhaust the Borlas replaced). With Borlas there's a good warranty (1 MIL miles). However, they come with rather large resonators to offset the compact mufflers (which I like -btw). The Borlas sound very aggressive under throttle, resonance is the btwn 1.8k rpm - 2.6k rpm. But -imho, the resonance is not that intrusive, (just got back from a long trip in the Z). Borlas are FULL Stainless, which I wanted, and I got them for a great deal, new. Have you tried looking into LaBree, it looks to be an excellent system.
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