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To RCT06GT, I did not install them myself or I did not buy them from Brenspeed. I got mine from Team JDM out in Freehold, New Jersey. As for how much for install, I'll get back to ya on that.
The slp's are loud but they sound raspy from the clips I'v heard. I like an exhaust with a low tone, I'm considering the mac, borla (frpp), and the corsa.