which gears would be better for all around on the street and on a 8th and 1/4 mile? and what mph does each gear get up to at red line?

 

Need more info, what transmission and tire size will you be running?

But the general rule of thumb is, A4 = 3.73 and M6 = 4.10

 

i have a t56 with 275/35 on 18s

 

Whats done to your car. Since you have a m6 4.10's are a good size to go with

 

3.90s.....

Stronger than 4:10 a tad longer in each gear, better mileage, etc...

I've ran both and will never go back to 410 or lower. It would be different of you had a cam and setup that needed the rpms in the 1/4. Say a big solid roller, etc.

I'm still having to wind it over 6300 going through the traps so I def don't feel you need lower than 3.90 in a mild street car.


JMO

 

just cold air and mass air flow

 

where is a good place to get 3.90s?

 

Anyone who sells Motive.