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1) lightweight wheels would be apex wheels. They are 18lbs a piece (about 10 lbs lighter than stock) and have the proper offsets for some serious rubber.
2) don't mean be a grammar Nazi but you want a turbo back exhaust as the turbos a downstream of the headers. Take your pic with this option and do some research.
3)If you want actual results make sure you get a closed cai (stett, Dinan, etc) the dual cone I takes suck in hot engine bay air and have been shown to actually loose power vs the stock airbox, and the stock airbox is pretty good to start with.
4)everybody is in a differen camp. You options include chip like jb3 (which most peeps recommend) and proceed. You can also do rme reflashes like giac or dinan, but these options are more expensive.
5) we don't have a lot of brake options. Fluid change and a switch to better compounded pads (cool carbons for street and hawks for tracks usually) or you can go with a full bbk
one more thing. The body roll in the 135i likes to trick you into thinking that the car has less grip than it does. You should add a front swaybar to our list, such as h&r, m3, or hotckis
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