I just got the info on three different exhausts for my new Murci. Which one should I go with. 1) Tubi for $3900. 2)Platinum Motors Stage 1 Sport Exhaust for $3900. 3)Platinum Motors stage 2 which they said "isn't street legal but its their most popular choice" consisting of cat bypass pipes, K & N freeer flowing intake and sport exhaust said to add 20 to 30 hp all for $5500. I'm leaning towards choice three but have only actually heard the Tubi and don't want the cabin to resonate like the exhaust on my X50 996 TT. Any input!!!