I got a 93 - F250 Factory Garrett Turbo with the 2 1/4" exhaust and am seriously thinking about going to the 3" ATS exhaust. I have already opened up the intake by going with a K&N RU-250 Turbo Filter and it completely eliminated the vacuum I used to see on the suction side of my turbo. I still need to bring the new filter into the fresh air stream, for now I just mounted it off the old turbo inlet housing where the fresh air duct used to connect. What I lost in milage due to the warm air the engine gets I seem to have gained in milage due to the elimination of the pressure drop so my overall milage is pretty much the same as it was.

A few questions on the exhaust upgrade:

1, For those who have done the 3" exhaust upgrade, how tight is the new 3" housing to the firewall on the F250. Is there going to be enough room to get some sort of insulation between the firewall of the truck and the housing and downpipe. (I have no intention of raising my truck to do this, I like the factory height, there is also the legality issue of raising the truck which I don't want to have to deal with.)

2, Has anybody got some good, documented milage improvements as a result of going to the 3" ATS exhaust. (Would it be to much to expect a milage increase of 1.5 to 2.0 miles per gallon, assuming I don't become a leadfoot after the upgrade like some of the guys on this Website)

 

you are in the wrong place. repost this in the idi forum right below this one.

 

Opps I goofed. Thanks for the reminder