I have an 07 hemi ram with K&N cai and Dynatech superMaxx Exhaust. And wanna put 90mm tb on it. I wanna have idea about performance. i hear it will run lean. i also understand i will run rich cause the LT headers. will that help or do i still need to take it to be tuned and will that tuning effect my SC 3865. Any and All help would be nice. also have powerwire and fm 50 do ex.
and thanks

 

There is no reason for it, the intake manifold where the tb connects is only 85mm so a 90mm simply is not worth it. Also a straight bore, specially that big still isn't even needed unless you go with new heads, big cam and 6.1 intake manifold.

The headers will lean you out, not make you run rich, so if you do decide to waste your money on this tb and it leans you out even more you will have to have it tuned or you can hurt your engine.

And your sc3865 will not do that, you need to either have a predator or a SCT tuner and have it custom tuned to get the fuel trims corrected, also need a wideband to make sure its right as well

If you want something that will play nice, is cost effective, and will run with what you have go with a fastman 85mm ported tb