Spoke with Fabspeed regarding muffler bypasses for GT3. They told me that they got a doner car in, fabricated the pipes and they are now in production, 2-3 weeks away. They indicated that you can expect a 15hp gain and a 40lb weight reduction by losing the mufflers...Does this sound reasonable, especially the HP gain??? Opinions appreciated. Sounds like the best $500 mod one could do....