Eh guys don't know this will help or not , for any Auto N16 with QG16DE OWNERS out there , if you want to mod your exhaust system to gain some little horsie , I have a suggested Setup to tell here ...
For Extractor , better get Hotbits Stainless Steel , Dyno Proven , Price 400 ++
Mid Piping Setup , Straight Flow Centre Muffler , Swirling Bullet , 1.6 " Piping , Price 450++
Rear Piping , 1.6 " Piping , S-Flow Top-Cat Muffler , though its Local Made , still it provides a low and not noisy exhaust note , and free up HP too ... Consider it ...