hi sifus...once again wanna ask noob questions here,
im already done my exhaust mod but suprisingly im using extractor 4-1 (i thought 4-2-1) because many said its good for auto tranny like me. im using just plain campro auto,
AFAIK, im using 4-1, bullet with 'twister' and s-flow muffler
so far its ok while driving, FC improved of course but problem comes when try to overtaking, like there lagging/not gaining energy while stepping pedal..@@
they claimed 4-1 setup is ok for city driving because 4-2-1 more to highway/long distance driving.(?)
the workshop said theres some mistakes because im choosing twister type bullet rather than normal one(kosong inside like recomended) because pressure will not enough power to blow with twister system.(?)
anyone care to explain to me?
quite confusing..so try to find out here 1st..

tq