Dear DKOR
thank you a lot for your quick relaxing reply , i felt kinda of relaxed coz of what you wrote :)
let me explain now what i did exactly .
a famous Auto Local Magazine compared the V6 Aurion with the New Generation of the Honda Accord 2008 V6 . during their comparison they run a dyno test for both cars , the stock aurion did 210 HP ( as you know it depends also on many factors , Temp , humidity , etc )
from this point , i get really excited ( FWD , 1625 KG with this HP , can do a lot with minor modification )
i went to a custom made exhaust shop , i asked them to take out the headers , remove the whole CATS out of it , then make a Y-pipe with 2.5" from connected from the headers till the end .
at the end i added 2 magna flow 2.25'' mufflers ( 240 USD each one )
the total cost was ( pipe + installing of the mufflers + the mufflers = 1120 $ USD
during my trip 8 months ago to Malaysia KL , i found a place in which i can find cheap Japanese rims , i checked them , i liked them then i bought them for only 800 $USD including every thing
i ordered from the InterNet K&N Camry 3.5L Intake with total cost 400 USD $ including the shipment
my friend has the same car with exact modefication , but he ordered TRD Exhaust insted of the custom made , he toke his ride to the Dyno and he informed me about the sheet results . infact i was thinking the same hence that such modefication can give you 20-30 extra HP
in the gulf area , the Auion does a lot of good amazing work against many cars ( Altima 3.5 SE MT , SS Holden 5.7 L , Hemi Charger 5.7 L , G35 Infiniti , etc ) but with the Chevy 6L L98 ( which called G8 Lumina , we have no hope at all )
thank you a lot again for your nice pro post and please feel free to ask anything you want to ask .
regards
Engineer Nader