Exhaust + Backpressure Question

[Rigaud]

Originally Posted by CoryM

I've not used a DC header, and exhaust flow is not overly simple, but it *should* help. The longer primary tubes help increase velocity. The primaries are larger on the DC which may not help in that regards, but people comment on the increased low-end so it's probably good. Short ram intake will probable not do much either way to be honest. Unless the Yaris is one of the few vehicles where the OE intake is choked up, replacing them often does not help (and sometimes makes it worse). If you want torque, consider a "Tooter spacer" http://www.yarisworld.com/forums/showthread.php?t=49609 it does the same thing as longer primary header tubes.

Putting the OE exhaust, with an aftermarket muffler, on will help too. The pipe size is fine, but the mufflers perform poorly.

Cheers.

What's your setup, changes?