The difference between a expensive one like Spoon an say xforce one as said, comes down to R&D, the types of metal used, the flow factor, heat resistant... alot of places may say all exhaust system are the same, crap talkers, they jus wanna sell there junk to you, research is the key to a well flowing, and performing exhaust system,it can be the difference between 10-20hp..... How the headers are designed will effect ur overall power band than any cat back system, so choose the right one for the application
id opt to go for a slighty larger TB, way less hassle over ITB, an much cheaper
ITb on a stock motor is as useless as a bigger turbo on a stock motor, to make every bit of it count, u really needa rebuild the whole engine, top to bottom, which can get $$$$
Go 4-2-1 for a street car, the low end torque will still be there
and also, stick to no foggies, as every em1 has em1 lol
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