Christ454

What is better for performance and/or fuel economy? I was thinking about getting a Diablo Chip or
getting a new Throttle Body and Plenum? Any suggestions for my 2003 4.6L GT. I already have aftermarket
exaust and cold air intake w/mass air flow. Any help would be great. Thanks,

C

jdaniel

I would say the intake would do you better. But I would get gears before either of the two.

BCisme

i agree. you dont need a tune yet. you don't need that mass air either, i'd put the stock one back in. you aren't outflowing it, so there's no point in upgrading it. you may even be losing power. the TB and plenum will give you about 10 hp, but the gears will be more fun and beneficial.

Tims 88GT

get gears and power VS fuel economy the power is better, buy a second car for fuel economy get a honda

code3GT

00Stang

gears gears gears!!!

Christ454

What ratio of gears are the recommended? Also, would gears be better than a supercharger?
I am seriously considering getting one. If I was to get one what would be the best fit for a '03
GT with a few mods on it? I have heard of vortech and another company but which is better? Any
help would be great. Thanks,
C!

03SilverGT

it all depends on what kind of supercharger you want IE centrifical (sp) roots, twin screw, do you want to make power in the lower RPM's or wait and build boost up top. Just depends on where you want you power. I personally think you would be happy with any supercharger you get. But if you want to go roots or twin screw i think Kenney bell would be the best, If you want centrifical i would go Vortech or procharger, with an intercooler. Also 3.73 gears would go best i think with roots or twin screw, 4.10 with a centrifical, but i dont really know so take it for what its worth.