320ish now and you can do so nitrous for some extra hp until the bottle runs out. I would go with low compression pistons and add a blower or turbo.

 

2003 Mustang Mach 1 Torch Red 5-speed IUP

ENGINE:

Ford Racing Aluminator 4.6L DOHC Long Block Supercharged 8.5:1 Compression Ratio
Kenne Bell 2.1 Mach 1 Supercharger System - Air to Liquid Intercooled
Gates Drive-align Tensioner Assembly
Innovators West Modular Motor 10% Overdrive SFI Approved Harmonic Balancer
Kooks Custom Headers 1 3/4" x 3" Ford 4.6L 4V Stainless Steel
Kooks Custom Headers 3" High Flow Catalytic X-Pipe w/2.5" Outlet
Borla Stinger Catback with 4" Chrome Tips
Accufab Polished Monoblade Throttle Body Assembly - 03/04 Cobra
SCT 3000 Big Air 90mm MAF meter w/Billet Housing
JLT 12" High Boost Cold Air Induction Assembly (2003-2004 Cobra) w/color upgrade to Torch Red
Sieman Deka 60# High lmp. Injectors
Custom Tuning by Tillman Speed Aston, PA
XCAL 3 Handheld Tuner

CLUTCH/TRANSMISSION:

SPEC Lightweight Steel Flywheel Assembly
SPEC 99-04 Mustang Cobra/Mach Stage 2+ w/Low Pedal Option Clutch Kit
Steeda Clutch Cable with Aluminum Clutch Quadrant and Firewall adjuster
Stock Ford Mustang Mach 1 Tremec TR-3650 Transmission
Hurst Billet/Plus Shifter w/Chrome Handle and White 5-speed Ball
Ford Racing Aluminum Driveshaft Assembly

REAR END/AXLES:

Eaton Detroit True-Trac 8.8" 31 Spline Limited Slip Differential
Moser 99-04 Mustang 31 Spline Hardened C-Clip Axles
Ford Racing 8.8" 3.73 Gears and Full Installation Kit
Royal Purple 75w140 Gear Oil

FUEL PUMP/LINES:

Ford Cobra Fuel Tank Sending Unit
Fore Precision Works Billet hat/Twin Ford GT Fuel Pumps/Filter/8-AN Braided Fuel Line

BRAKES:

Baer Decelarotor Cross-Drilled/Slotted Rotors w/Stock Calipers
Hawk Carbon Fiber Autocross Brake Pads

WHEELS/TIRES:

AFS All-Chrome Mach 1 Style Wheels - 17 x 9 Front 17 x 10.5 Rear
Summitomo HRZ 275/45/17 Front 315/35/17 Rear

SHOCKS/STRUTS:

Tokico D-Spec

CONTROL ARMS:

Stock Front K-member and Control Arms
Steeda Steel Lower Rear Control Arms - 99-04 Mustang

INTERIOR:

Stock Driver/Passenger Seats
MMR Rear Seat Delete
Hurst Billet/Plus Shifter w/Chrome Handle and White 5-speed Ball
CJ Pony Parts "Mach 1" Floor Mats

GAUGES:

Speed of Sound A-Pillar Dual Gauge Pod
MRT Interceptor Instrument Cluster Replacement
Autometer Dual Gauge Instrument Bezel
Autometer Cobalt Series Vac/Boost Gauge - 2 1/16"
Autometer Cobalt Series Fuel Pressure Gauge - 2 1/16"
Autometer Cobalt Series Water Temp. Gauge 100-260 Degrees - 2 1/16"
Autometer Cobalt Series Digital Wideband Air/Fuel Ratio Gauge - 2 1/16"

EXTERIOR BODY:

4.6 High Performance Fender Badges (Replace Running Pony)
American Muscle 14" Black Shorty Antenna
Ford Racing Hood Pins w/Lanyards (The Real Deal)
MRT Hydraulic Hood Lifts
Retro Cobra Jet Shaker Emblems
American Muscle Clear Fog Lights
Visus Aluminum Rear Window Louvers
Custom Third Brake Light Overlay - Says "Midnight Mustangs"
All Detailing by ME and Meguiars Products

 

I guess Ill start off with the mods then list power/times.

Mods-
Viper Spec t56 trans
spec stage 2 clutch
aluminum driveshaft
4.10 motive gears
Vortech v2 sq mongoose kit w/3.33 pulley
lightning 90mm maf
Focus SVT pump
40lb injectors
DIY FMIC
vortech mini race bypass valve
professional products upper plenum/75mm tb
mac o/r h-pipe
slp lmII catback
Strange 10 way adjustable shocks and struts
UPR solid lower control arms
moser 28 spline axles (in the middle of the swap as I type this actually)
Innovate lc-1 wideband and gauge
autometer boost and oil pressure gauges

probably more I'm forgetting but that's the major stuff

The car has ran a 12.1@115 with a crappy 1.76 60'. I've been working out all of the suspension to get traction and that was the best I ran last fall. I got it hooking so well that on the next run after spinning on the launch and running 12.1 that I broke the axle so It should run a little faster. It made 385 rwhp last time I dynoed it but it should be up around 400 this year after fine tuning everything

 

here goes mine. black mustang letters on the back. small ford racing stickers (really small, with a pretty chick) on side windows. Barely got my car like 3 weeks ago. jeje I think short shifter and gears would be my first mode.

 

2003 Mustang GT "premium package"
Hardtop 5 speed Dark Shadow Grey

Engine:
Hellion Turbo kit with T-62 @17psi and cat delete
DSS shortblock- windsor block upgrade, race balanced forged cobra crank, dss pro lite h beam rods, arp2000 rod bolts, probe 18cc forged pistons standard bore, high output frpp oil pump, high volume oil pickup tube, arp head studs, fel pro mls head gaskets, ported pi heads with valvejob, manlex nextek valve springs, comp hi load retainers, stock cams
stock intake
Flowmaster cat back

Fuel:
Siemens Deka 60lb injectors
03/04 Cobra pumps with pprv delete
Kenne Bell Boost a Pump
SCT ba2800 maf

Drivetrain:
Spec stage 3 clutch
Spec aluminum flywheel
Pro 5.0 shifter

Suspension:
UPR k member
MMR A arms
UPR front coil overs 250#
H&R SS rear springs
Tokico blue shocks and struts
UPR bumpsteer kit
Maximum Motorsports 4 bolt cc plates

Exterior:
anthracite Bullitt Replica wheels 17x9/17x10.5
Mach1 grill delete
spoiler delete
Bullitt sideskirts
Bullitt sidescoop delete
Bullitt c pillars and glass
19% tint
red painted calipers
black rear bumper lettering
taillights tinted 50%

Interior:
Autometer c2 boost and wideband a/f
white face gauges
autometer pro lite shift light
billet window switches
flip out dvd player
component speaker sets all around

probably forgot a couple things...should be over 600whp

 

Numbers in my sig.

Mod List

Engine
18cc manley pistons .020 over
Modmax 4340 H beam rods
Kellogg cobra crank
ARP main studs
ARP head studs
Felpro performance gaskets.
Stage 3 Patriot heads
CMS stage 3 blower cams
MMR cobra oil pump
Canton 7qt oil pan
TFS Trackheat intake
Solid motor mounts

Exhaust
Mac longtubes
Cam o/r H pipe
Slp loudmouth 2 catback

Poweradder
Paxton Novi 2000 race version
3in RR pulley
Innovators west 10% OD crank pulley
Ebay 4in intercooler
3in custom welded intercooler piping
ProM MAF
Mondo bypass valve
AIS meth system

Ignition
weaponX COP
3 step colder ngk plugs

Fuel
Custom sumped tank
A1000 fuel pump
100 micron filter
10 micron filter
-10 feed line (to Y block)
-8 feed line (from Y block to rails)
Aeromotive fuel rails
60lbs injectors
A1000 bypass regulator
-6 return line

Cooling
Meziere electric water pump
180* Tstat
Mishimoto aluminum radiator (fabricated to fit)

Brakes
Linelock

Gauges
Autometer C2 wideband
Autometer C2 fuel pressure
Autometer C2 oil pressure
Autometer C2 boost
A pillar triple pod
Steering column single pod

Front suspension
QA1 kmember
QA1 coilovers
QA1 adj struts
Steeda bump steer kit

Rear suspension
Megabite jr. lower control arms
Baseline suspension pro launch upper control arms
Baseline suspension antiroll bar
QA1 adj shocks
QA1 coilovers
CHE shock tower brace
Welded torque boxes

Rear end
33 spline moser axles
Spool
4.10 gears
C clip eliminators
Welded tubes
CHE axle brace

Wheels
17x9 black chrome 03 cobra (front)
17x10.5 black chrome 03 cobra (rear)

Exterior
01 cobra front bumper
Paint matched mirrors
03 cobra rear bumper (waiting to be installed)

Drivetrain
Spec stage 1 clutch
Aluminum driveshaft

 

Performance Modifications:

-Flowmaster 40 Series Mufflers
-BBK Off Road H Midpipe
-MGW Short Throw Shifter
-Ford Racing 3.73 Gears with Carbon Fiber Clutch Pack
-275/40/17 Nitto 555 Street Radials
-Upgraded Braking System
-SCT XCal3 Tuner Custom Tuned By Dayton Performance
-Steeda Sport Lowering Springs
-Professional Products 75mm Polished Throttle Body
-Accufab Polished Plenum
-Raptor Red LED Shift Light
-Procharger D1-SC
-3-Core Race Intercooler
-SVT Focus Fuel Pump
-42lb Injectors
-ProFlo Blow-Through MAF
-TR6Spark Plugs
-ProFlo Surge Bypass Valve
-Summit Upper Control Arms
-Summit Lower Control Arms

Exterior Modifications:

-Mach 1 Chin Spoiler
-5% Side Window Tint / 2.5% Rear Window Tint
-17" Chrome Cobra R Rims
-2.25" Cobra R Center Caps
-Rear Bumper "Mustang" Inserts
-4" Magnaflow Exhaust Tips
-3rd Brake Light Tint Reading "Purdue"
-DupliColor Red Painted Brake Calipers
-14" Shorty Antenna
-Tinted License Plate Covers
-Bullitt Fuel Door with Black Pony
-Sylvania Silverstar 9007 Headlight Bulbs
-Blackout Headlight Covers

Interior Modifications:

-Ford Racing Bullitt Pedals
-Various UPR/MGW Billet Pieces
-AutoMeter Ultra-Lite Gauges
-AutoMeter Steering Column Pod
-Sound of Speed 3 Gauge A-Pillar

Tuned by Dayton Performance:
383rwhp
371tq
13lbs on 3.8" pulley

400+ next dyno

 

Not Really A Big Bad Mustang GT.

2000 GT, 5 Spd
Mods
Air Silencer Delete
K&N Airfilter Drop In
Trickflow 75mm Tb And Plenum
Steeda UD Pullies
Stock Headers
Stock PI Heads
Stock PI Intake
Stock PI Cams
Hooker o/r X Pipe
Flowmasters American Thunder 40 series Catback
Spec Stage 1 Clutch & Pressure Plate Kit
3.73's
SCT Tune
Dyno Tune 93 Octane
MT Streets (26/11.5/15)
267Rwhp 303.8 Ft-Lbs
1/4: 12.9 (Best Time)

 

Do you even feel like the throttle body & Plenum made a difference?

 

Yeah But Nothing astronomical, "Match Your Parts" and it will make a difference. anyone can throw random parts together and make crazy power but if you do it right and are able to put the power down then that's all that matters.