i just installed my tein flex coil overs yesturday and they are f**king awsome. As of right now their still set on the stiffest setting cause i havent messed around with it but i deff need to cause it is very bouncy!! so now i have 4.56 gears, berk technology test pipe, cat back custom exhaust, MB Quart component speakers, alpine amp and a alpine head unit, and the tein flex edfc. just waiting for my compitition clutch and fly wheel. quick ? though would the j's 70mm exhaust and the new berktechnology 50mm header be a good combination?