what i can say is,that is no R&D for an extractor
they show dyno/and all the blue print just wanna attract the customer to trust them
only one person who do the R&D and those welding/developing by poor Bangladesh with cheap salary
i think you guy can realize the speedworks website already stop posting the exhaust system picture
because so many copy cat follow their design/setting
Mr Toh from speedworks i respect you
but this malaysia market all copy cat,i think u are a cleaver person,just continue developing your business in western country
ai..already talk so much one more source for you guy
alibabanow a day the china so cleaver to copycat,use your comment sense then u can understand what i means,just make sure you paid for what u want
because those china product can put whatever name you want..get it?

the most perfect exhaust setup without ECU-Management,maximum only can gain 10hp
but malaysia mod style

normal less then 8hp
depend on owner if willing to spend more to giant just 8hp it is up to you
any way i just come in to talk talk for fun and i like to share
for campro you can use follow the setup below,
but no need to spend money for the midbox,just use the original n if you worry noisy just keep using your original muffler because muffler just reduce sound only nothing much power gain

for 4g18
Auto:do not decat(with original piping)
change to 4-2-1 extractor-flexipipe--original catcon-----rear bullet change to 4"inch body ovel midbox just like this

but 12inch long is more then enought muffler you can keep ori
Manual:decat(original piping)
change to 4-2-1 extractor-flexipipe--straight flow bullet---ori bullet keep use--rear muffler change to Straight flow if you worry noisy use oval muffler if you want low bassy use N1 style muffler
All the Airflow Sensor for extractor must be relocate to bottom to make sure the sensor accurate reading the airflow from the 4 cylinder

anything wanna shoot me or wanna share can call me on 012-2023765 because 4g18/campro easy job to mod