Any mods that enhance MPG AND power?

[dngz]

brought up a really good point. Going with a too big of an exhaust or having a crappy header will lower your power. I believe people here has upgraded to a 2" to a 2.5" exhaust, nothing more.

[Imagine]

Originally Posted by dngz

brought up a really good point. Going with a too big of an exhaust or having a crappy header will lower your power. I believe people here has upgraded to a 2" to a 2.5" exhaust, nothing more.

2.5 inch exhaust on a naturally aspirated Yaris!? Thats nuts!!! I wouldn't go over 2 inches max without some sort of forced induction. 1.5 inch would probably work better. Turbo cars and V8s usually run 2.5-3 inch exhaust. Be very careful of the parts you buy though. Do a lot of research for before and after dyno sheets and pay close attention to the HP and torque at lower RPMs. See if there is any decrease in power. Especially around the 2500 - 3000 RPM range since that is where most of the street driving takes place. Don't fall into this 5HP gain trick. Yes, you might gain 5hp at 6000 RPM but there is a good chance that you lose torque or HP at the low and midrange areas. I don't know about you, but spending $300-$400 on something that is a power decrease where I drive most seems like a waste of money to me.

[dngz]

Originally Posted by Imagine

2.5 inch exhaust on a naturally aspirated Yaris!? Thats nuts!!!

I personally have a 2" exhaust. I know others here who have 2.25" and 2.5" and they have not complained about losing any low end tq yet.