Now that we finished dynoing Power Pack 1, we were ready to install Power Pack 2. PP2 is slightly more involved with the removal of the sound tube and throttle body, but it is quite simple, quick, and easy to do with basic tools.
First up was to remove the ridiculously named Mustang “Sound Sympozer Tube” via a hard to reach nut behind the driver’s cylinder head on the firewall.
After removing the Sound Sympozer Tube, we replaced it with the supplied plug, pictured below the tube.
After unbolting the air intake tube, airbox, and removing the sound tube and vacuum lines, we lifted the stock air intake assembly out of the way.
The stock Mustang GT air intake (left) has a noticeably smaller intake tube than the beefy GT350 “Cold Air Intake” (right) that lacks the two prominent sound resonance chambers which are equipped on the stock intake. It’s a nice bonus for the GT350 intake to come pre-installed with an expensive Mass Air Meter. The factory airbox is truly a “Cold Air Intake” since all the air that gets ingested by the engine comes from the “cold” outside air via the front grille, meanwhile the GT350’s “Hot Air Intake” ends up pulling in a lot of hot engine bay air from the poor sealing to the hood.
The stock GT airbox inlet is a bit narrower and taller than the shape of the grille inlet of the GT350. The supplied instructions show where to cut two slits in the new snorkel’s rubber seal for it to function with the stock Mustang GT grill.
Page 1 – Power Packs
Page 2 – Baseline Dyno
Page 3 – K&N and Power Pack 1 Dynos
Page 4 – Power Pack 2 Install
Page 5 – Power Pack 2 Dynos
Page 6 – GT350 Intake Manifold Analysis
Page 7 – GT350 Intake Manifold Analysis & Install
Page 8 – Power Pack 3 Dynos
Page 9 – Thrust Analysis of PP3 vs PP2, and Bonus Dynos (M3 & GT350R)
Page 10 – Road Test Review and Overview