Che , im gonna give u the same basic advice i give most people.
SAFETY first: double check all your important components first and see if anything major is obviously in need of repair. this also goes a long way toward a secondary goal of RELIABILITY. DO THESE 2 things before anything else so you know you have a car thats not gonna break right away and / or KILL you . a racing seat and mini cage w/ a 5pt harness is good too.
if you do these 2 things first you now have a good baseline established to know what your "improvements" change and whether its better or worse.
a quick and easy thing is to lose the interior or parts of it if you dont care/or need it all (lighter is better) and is easily reversible if needed.
change only 1! thing at a time if possible and note the results.
after your initial assessment and repairs have been made tires( widest you can fit and compounds) are a huge improvement over stock , as you well know. ( rims +1 or +2 or more is up to you).springs-shocks/struts-antisway bars - suspension bushings- lighter and stronger suspension components, go a long way in a more tractable vehicle.
BRAKES : one of the most absolutely critical/important items on your car. go with the best you can afford . i know you got the brembos so find better pads!!! i dont care how fast your car can go if you cant stop it , cuz if you wad it up its useless and it hurts.
dont go with any major power adders until you explore simple things that all add up such as : fluids- belts/pulleys-air intake and filter- plugs-wires-ignition-cooling upgrades- maybe some headers and exhaust. a commonly overlooked item is the mechanical advantage of a new rear gear set to get it moving quicker than be for , one of the best bangs for the buck out there, period.
now you have a mildly upgraded and way more reliable and way better performing auto. if it still aint quick enough for you then think super-charger. less lag and heat. they been around for along time and are usually easier to install in most cases. while there have been some major improvements in turbos i still think that they can be a pain.
if you go with too much boost then thing engine rebuild/blueprint , more displacement etc.
now the cool part , you guys at TURN10 , whether you like it or not are part of more than just the video game world. you are in the automotive field , and as such you guys should use your connections to get some upgrades for cheap and or free . you can give parts manufacturers some publicity in exchange, and you should take as much advantage of this as they should ( quid pro quo ).
after you guys build em up we want DLC versions of em too.
good luck and you guys keep updating us on how its going.
peace
P.S. im so gonna ruin my tires when my " fuel your fantasy plates " arrive!
HAVE A LOOK AROUND :peace
GOV's Garageco-founder FMGTCS #45
member PG29
AND CTT