Horsepower GainsHome | Free Mods | Intake | Ported Heads & Manifold | Exhaust | Gears | Transmission | Brakes | Parasitic HP | Fuelling | Interior | Weight | Performance | HP Gains | PartsLow/no-cost starter mods Remove air silencer & MAF mesh screen +5rwhp Short belt AC/smog pump bypass & ASP underdrive crank pulley +8rwhp Advance ignition timing +3rwhp Simple bolt-ons C&L 76mm MAF/CAI kit +5rwhp (over air silencer/MAF mesh screen delete) Larger bore throttle body +0rwhp (but sharper throttle response) With the intake side uncorked, the engine will respond better to exhaust upgrades: High-flow mufflers +5rwhp Offroad X-pipe +11rwhp Long tube headers +7rwhp Higher ratio roller rocker arms reduce valvetrain friction, increase valve lift, and increase 0.050" lift valve opening duration without changing the stock camshaft. While there's only a modest HP gain if the stock cylinder heads are still in place, the gain is greater when higher-flowing aftermarket heads are installed. 1.7 ratio roller rockers +4rwhp With this simple package of mods, the output from a '94-'95 Mustang 5.0 GT with a T5 manual transmission can be increased from the stock average of 192rwhp (168rwhp with AODE or 220hp flywheel) to about 240rwhp (210rwhp with AODE or 275hp flywheel) for an easy 25% gain. At the 275hp level, the stock 87lph fuel pump and stock 19lb/hr injectors will be performing very close to their limit so a higher-flowing fuel pump, injectors, and an adjustable fuel pressure regulator will be required before proceeding with the next stage of performance mods (heads, camshaft, intake manifold or H/C/I). H/C/I combinations GT40 heads/stock cam/GT40 intake/1.7 rockers/65mm TB: 310hp/360lbft (270rwhp/315rwtq T5, 240rwhp/280rwtq AODE) GT40P heads/stock cam/GT40 intake/1.7 rockers/65mm TB: 330hp/375lbft (285rwhp/325rwtq T5, 255rwhp/290rwtq AODE) GT40X heads/E303 cam/GT40 intake/1.6 rockers/65mm TB: 340hp/370lbft (295rwhp/320rwtq T5, 265rwhp/285rwtq AODE) Edelbrock 60379 heads/E303 cam/Performer intake/1.6 rockers/70mm TB: 360hp/375lbft (310rwhp/325rwtq T5, 275rwhp/290rwtq AODE) Holley 300-575 heads/Lunati 51027 cam/Holley intake/1.6 rockers/75mm TB: 370hp/375lbft (320rwhp/325rwtq T5, 285rwhp/290rwtq AODE) AFR 165 heads/CompCams XE270HR-12 cam/Performer RPM intake/1.7 rockers/70mm TB: 370hp/390lbft (320rwhp/340rwtq T5, 285rwhp/300rwtq AODE) TFS Twisted Wedge heads/TFS 1 cam/TFS Track Heat intake/1.6 rockers/75mm TB: 375hp/385lbft (325rwhp/335rwtq T5, 290rwhp/295rwtq AODE)
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