Ok as the title claims, im considering getting a full sportivo exhaust system on my 1zz... im talking from extractors back to the tip of the muffler... so my questions about this idea: 1. what exactly do we have in a stock sportivo system? 2. what is the diameter of the piping? ive been searching and still cant find a definate answer of whether its 2" or 2.25"... i need to get a CLEAR answer from someone... 3. is the cat a higher flow cat than the stock 1zz cat? here's a cruncher question -what is the capacity of the sportivo cat? 4. am i likely to get good gains with all the stock sportivo stuff, or would it be better to get new piping and get 2.25 from my extractors back through a new high flow cat and into an oval muffler that i choose...? (im just afraid of making my pipes too big and losing back pressure) 5. how much should i be looking at spending for this system? im going to call up some wreckers and see what they can do for me... ok if you can answer any of my questions, feel free to :P cheers guys, Tom