it helps with all FMIC kits that run clockwise piping. it literally knocks off 2 feet or more. our wrx's that have the plastic mani that has the TB facing the drivers strut tower has FMIC piping that runs counter clockwise so the pipe is very short to beging with. going reversed keeps my bends down and a little bit of lenght because putting the STI mani on will make me use the cold side STI piping.
like chris said reversing the stock 08+ mani would be hard but not impossible. the power steering pump would need removed and would have to go rotated. all you have to do is get at least 8mm phenolic spacers, buy a shorter alternator belt so you can losen the alternator tensioner and push it down all the way and install the new belt, then bolt the mani on back wards. if you have a DBW TB you have to flip it so the motor sits upward so it doesnt hit the AC pump. if you have DBC you need to remove the AC pump i believe. then of course get piping to fit.
i already bought used 8mm GS for $50 so i saved a little. as you can see there a little larger like the gaskets so maybe before install ill PnP the mani. im sure the kstechs are the same or else if you PnP your mani or TGV's then the spacers would be in the way of flow.
ill know when i pull them. you made a good point too, the motors and butterflys and such should add weight to the plastic mani that they might end up being the same in weight. of course real test would be tgv less and then compair.
^^ I would go all white. White wheels, white grill, mirrors, etc. But I like solid color cars. Just a personal opinion. As a two tone that looks good. Or do every thing above the bottom of windows black, door post, full wing, trunk, tint windows dark????
You'd need to submit a un-ms painted STI or other people would have to find their own photo. Because the ms paint job destroyed the features of the car. I have photoshop...but, i'm not the best with it.
378awhp/373wtq Custom Dom 3 & CBRD tuned 2006 STI.
"When in doubt...flat out" - Colin McRae