I am thinking of changing the entire exhaust system on my 1.3 Iswara.
But now... i'm facing a dilema.

Should i change the stock to larger 4-2-1 header or 4-1 header?

Anyone got comments on which is better for the iswara 1.3 engine?

My car modding adviser tells me to change the default stock 4-2-1 to a larger piped 4-1 header; and that it would add more pickup.

What do you guys think?

its a manual...

currently i am using stock 4-2-1. exhaust piping changed from the midbox onwards. changed to larger piping and muffler s-flow marco muffler.

so 4-2-1 for midrange rev power while 4-1 is for high rev power?
i guess 4-2-1 will save alot of fuel since the engine doesn't need to be revved high to achieve tourque. but issit true that 4-1 set up will deliver a better pick up overall?

rev till 8krpm burn alot of fuel kao kao ar? xD

This post has been edited by tineagle: Apr 22 2008, 05:46 PM

1 more question. does a bullet provide better airflow than a midbox? whats the diff between the two?