exhaust on avanza 1.3

[andyshim89]

I just add on new straight muffler, but the sound not loud...and i on auto tranny,
so, if remove the ori muffler, the pickup will sucks.....

any recommend beside go for S-flow muffler, since i brought and install already the straight pipe muffler...

anyway to keep the back pressure?? two bullet ? instead of 1 bullet now using..
and the piping is original diameter...

 

[DanzEterna]

for auto, better u s flow type exhaust, if u use straight pipe u will loose back pressure, hence lost of power.

i suggest mugen twin loop.