Mustang 03 GT

I have a 03 GT (5-speed) with the following mods: Flowmaster cat back exhuast, o/r h-pipe, K&N CAI, and a intake spacer. I was wondering what would you guys recommed for next mod. Steeda udp pulleys or throttle body & plenium (70mm). Any input would be greatly appreciated!

sleeping stallion

how about some gears if not i would maybe do the tb and plenum

Mustang 03 GT

I will be installing 3:73 gears and a brenspeed tune in about 2 weeks.

POISND U

How about some suspension work?

sstang

If you get the TB + plenum get 75mm

Mustang 03 GT

I was thinking about getting 75mm. I called the summit tech dept and they recommeded 70mm. The technician said that 75mm would be too much for a lightly modded mustang and suggested 70mm. What's the differnce between the two? Also If I were to buy the throttle body 1st and the plenium later would it make my car run bad?

03greyGT

70mm will help with down low power and the 75mm is for top end...I have the 75mm and its fine..Id get the 75mm anyways. Do the t.b. and plenum or udps...

Mustang 03 GT

Which do you recommed first? UDP's or TB?

99BlackPonyGT

i heard UDPs are worthless for the most part...i wouldnt spend the money on them....go with tb/plenum

Mustang 03 GT

Thanks for the advice. You are the first person that I have ran across that has said udp's are not a good mod. I have heard that the BBK and other brands are bad becasue they are piggy back. Everyone that I have spoken to say's that Steeda is the way to go. What do you have done to your car?