What are some recamendaions for add ons?
 

I have a '05 V6 manual mustang, so far i've added true dual exhaust, k&n air filter and jet performace chip. What else should i add that would be noticeable in performace?

Gears.

does it make a difference what ones? i heard of the 4.10 and the 3.73?

typically 3.73 for manual

are the 3.73 better? because i've raced a '04 V6 manual and he had 4.10 and i beat him.

it's all down to driving at that point. The 4.10's do have a torque advantage but that can also lead to excessive wheel spin at launch and the need to shift earlier in the run. I don't particularly like 4.10's anyway.

3.73's FTW.

FWIW... I'm happy with 3.55's in my GT.

what about a differentional? i'm not to fond of the one wheel spin, and for the gears. it's gonna make my RPM's run higher when i'm travel like long distance at high speed?

traction helps performance... and yeah, the gears will cause you to run a couple hundred rpm higher at freeway speeds.

4.10
 

yeah go with the 3.73 for manual, usually you go with the 4.10 gears for automatic, from what i've been told

the new v6 stangs respond really well to superchargers. That is what I would suggest if you have the money.