2012...Magnaflow good choice?

[suss6052]

Originally Posted by 1948 panhead

Is the K&N open on the end?

Not the drop in filter. The one that comes with the 57S lid kit has a removable plug for the end of the filter

[1948 panhead]

The one that cast 170.00?

[danno428cj]

Originally Posted by suss6052

The 2.5" would have a lower restriction than the 2.25" tubing, however if you go too large you reduce the backpressure too far and start to hurt performance.

Its been discussed that the 2.5" might be a better plan if you are planning on adding additional power adders down the line. If the limit of your modding is an intake and exhaust and nothing else a 2.25" exhaust may work better.

Back pressue is not a factor in direct injection engines, as fuel charge scavenging can not happen, becasue the fuel charge is delivered at full compresion.

[rbpexman]

Are you asking if it's a CAI? No...it's a drop in...in the air box.

[cobrajet429]

Originally Posted by danno428cj

Back pressue is not a factor in direct injection engines, as fuel charge scavenging can not happen, becasue the fuel charge is delivered at full compresion.

No but you still need to clear the combustion chamber of burned gases.

[danno428cj]

Originally Posted by cobrajet429

No but you still need to clear the combustion chamber of burned gases.

Yes, that's why we have such things as cam overlap. Back pressure would prevent some gasses from leaving the chamber.n

Remember these motors run 12:1, they are probably pretty good at clearing the cylinder anyway.

[TheDriver916]

Has anyone seen more than 2-3 mpg increase with the exhaust?? Not that it should but who knows its possible to get 4-5 with an intake and exhaust system right?

[Joey D]

Originally Posted by TheDriver916

Has anyone seen more than 2-3 mpg increase with the exhaust?? Not that it should but who knows its possible to get 4-5 with an intake and exhaust system right?

With the Magnaflow and the Steeda CAI I haven't noticed a change in my mpg at all. It's still roughly 34mpg in the city with winter tires and 32mpg with summer.

[cobrajet429]

Originally Posted by danno428cj

Back pressue is not a factor in direct injection engines, as fuel charge scavenging can not happen, becasue the fuel charge is delivered at full compresion.

You want too still cram as much air as possible with a scavenging affect. Air is still a factor in power making.

[danno428cj]

Originally Posted by cobrajet429

You want too still cram as much air as possible with a scavenging affect. Air is still a factor in power making.

Right, and having less exhaust backpressure, by removing restrictions in the exhaust system will increase this effect to a point.

People are getting all bent outa shape about loosing back pressure in these Focus motors, it's not as much of a foctor as say a Honda. Opening up the exhaust systems on these new Focus engines is really going to wake them up.