LOL, nice, thats gonna change that car completely. Adding just the 3.73's woke my car up nicely, enjoy that! 3.90's are a great choice, would have got them if i wasn't misinformed of Motive's quality.. Anyways, those plenums have some pretty nice gains in certain areas of the hp curve and even without the huge peak gains, they are definitly a nice little gain. Modular depot is great, been a member there for a long time now myself.
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WhiteDevil 
2003 Silver GT
Audio/Visual
2 12" Massive Audio RW's
Kicker 800.4 & Hifonics ZX7500 amps
Diamond/Infinity audio highs
Mach 1 chin spoiler & Grill delete
Steeda Sports Springs
Mods
BBK Tuned Length Headers
Magnaflow O/R X-pipe
Magnaflow Catback
17x10.5 & 17x9 Chrome Cobra R's
315x35x17 Nitto 555r DR's
FRPP 3.73 gears w/ brothers speedcal
Pro50 Short Shifter
BBK aluminum U/D Pulleys
Awaiting Install
MM Full length Subframes
Next
Cams/Nitrous 
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