3.55 gear ( The hardcore guys alway push for the 4.10,but even a STREET NON-DAILY DRIVER will goes on the freeway more then once in their lifetime,it is just too much for me to see 2800-3000 rpm at 65mph freeway speed.
High Stall converter ( This with the gear will wake up any AOD car, I run a B&M Holeshot 2400,they are not very expensive and is a good stock replacement. Again the brand choice is yours but don't go too high of a stall *. ) * Transmission cooler is a must if switch to a higher stall converter,but it is alway good to have one on a AOD car even if you did not .
Aftermarket valve body or shift kit ( For a clean and crisp shifting of your tranny,you could even hold it in gear,lot of choice out there.
2.5" cat back exhaust ( Flowmaster,Mac,Dynomax etc,most base those on how the exhausts sounds,the hp gain is very close ).
2.5" H or X pipes with high flow cats ( I run a H Pipes WO/Cat before and when I switch back to the catted one,I noticed there was a noticeable gain of low end torques,I think AOD car run better with catted exhaust ).
Shortie header 1.5" ( Stay with the name brand as the fits and finish are better,you can pick those up for cheap used now days ).
GT40/Cobra style upper/lower intake ( I chose those because it it available everywhere for cheap and everything bolted back on ).
70mm throttle body ( Opening of most aftermarket intakes are 70mm,same as the GT40 style,no need to go larger unless you are pushing 400rwhp ).
70-75mm Mass Air Sensor ( Match to your Injector size,anything bigger with just simple bolted on parts is a waste and harder to fit ).
Stock injector ( Those should be good at this power level,go to 24 or 30 if you are getting Alum heads or supercharger ).
Stock cam ( Good all around cam )
Stock head ( Good if you are not planning any major engine works ).
K&N Air filter ( Flat panel stock type re-using stock filter air box or aftermarker cold air intake goes into inner fender,very helpful and will pick up a few HP ).
Air Silencer ( Removes it will gain you around 3 hp and it is cheap as in FREE ).
Electric Fan ( Free up around 10 hp,less drag on the engine,just make sure it have the airflow to cool down your engine,the Ford 3.8 Taurus Fan is a great hot rod trick and the Black Magic Mustang spec fan should be ok for the cooler parts of the country ).
Lightweight Drag Wheel ( Weld,Centerline etc. Stock wheels are heavy. You could saved over 100lbs with those wheels front and back, and you can get them in good shape and cheap. Local sale is better,as shipping could adds up real fast ).
Timing ( Most car will gain a few hp if the timing is bump up,it is free hp and as every car is different,you have to play around to see what your engine likes. Good gas is a must now ).
MSD 6A or 6AL and a better coil ( Hotter spark and better burning of the mixture in the combuston chambers,gain a few hp ).
Tune up- New spark plug wires,plugs,fuel filter,cap and rotor,oil and filter etc,etc. It is now 2009. Seen a few Fox body out there still running the same OEM spark plug wires.
Those are all basic types of bolt-on or engine and transmission work. It will help your Mustang goes faster and build a base for the more major build up. Most by themself give you a few hp and torque gain,but it all adds up in the end. Throw a Supercharger pushing 9psi on top of it and you will have a very fun and fast street car. Best of all,your car should be still emission legal and you won't pull your hair out to put it together. Everythings on the list just about using stock bolt holes or mounting bracket.
