tooter's manifold adventure...

[4/20 NEVER FORGET]

Originally Posted by malibuguy

I work on A LOT of hondas. Most of the header outlets are 2". Even for a b18 teggy I worked on last tuesday. Dont let the small collector fool you. 2" is just about perfect for our motors. You want the exhaust gases to be at a high velocity when leaving the motor. The stronger the pulse...the stronger the vacuum behind that pulse. Thats what makes power. The larger the pipe the weaker the pulse strength would be and it will be traveling at a slower rate

Good to know. What do you think of my plan of going to 2.25" piping/cats/resonator throughout on the exhaust? It's what my old D16 civics ran and it seemed like a good size.

Also tooter, do you still have the 1.75" exhaust piping after the factory resonator still in place? It might be worth paying the small amount to have that replaced with a 2" or 2.25" back to the axle-back.

Also, I recently replaced my crank pulley with a MI crank pulley and I didn't notice much if any change in engine output. I did notice however that the car is easier to drive, matching revs and such. For having nothing but manual transmission cars my entire life, I drive my Yaris somewhat jerky. I would say I drive the car a bit smoother now as I go through the gears. Eventually I plan on getting a lightened flywheel, I've had them in multiple cars in the past and it makes a huge difference in the car.