DC sports header installed.

[Joker]

Generally 4 into 1 headers are designed for gains in the higher rpm range (5000+) which also generally means you lose your bottom end. As most people on this board know that normally aspirated cars will benefit from intake/exhaust/header mods but carefully choosing these parts is the key. I also know that only about 2-3 people on the board actually put their car on a dyno. I would be curious what gains if any this header provides under 5000 rpm vs. the stocker. Not everyone tools around at 5 grand plus all the time. Just my 2 cents....

[YarisTom73]

Originally Posted by Joker

Generally 4 into 1 headers are designed for gains in the higher rpm range (5000+) which also generally means you lose your bottom end. As most people on this board know that normally aspirated cars will benefit from intake/exhaust/header mods but carefully choosing these parts is the key. I also know that only about 2-3 people on the board actually put their car on a dyno. I would be curious what gains if any this header provides under 5000 rpm vs. the stocker. Not everyone tools around at 5 grand plus all the time. Just my 2 cents....

I think you make a good point, particularly considering the VVTi takes over at higher RPM and thus the bottom end is already the weaker end of the spectrum when it comes to our Yaris' powerband. So, if there is even the most remote chance that this or any header could reduce bottom end power, count me out . There's two more cents

[largeorangefont]

Originally Posted by Joker

Generally 4 into 1 headers are designed for gains in the higher rpm range (5000+) which also generally means you lose your bottom end. As most people on this board know that normally aspirated cars will benefit from intake/exhaust/header mods but carefully choosing these parts is the key. I also know that only about 2-3 people on the board actually put their car on a dyno. I would be curious what gains if any this header provides under 5000 rpm vs. the stocker. Not everyone tools around at 5 grand plus all the time. Just my 2 cents....

I'm not going to waste the money to dyno the car, but there is a noticable power increase BELOW 5000 RPM. The car even takes off from a stoplight easier. The bottom to mid range gain was more dramatic than the top end gain.

Keep in mind, all I have done to the car is the header and a light crank pulley.

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