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i'd run from anybody that made wild claims like that. first off bigger injectors will do nothing at all. the only time you need to up-size is after you have done big power mods like head/cam, FI or nitrous and exceed over 80% of their duty cycle. as for power gains and mileage it will depend on how far your tune is off. altho every car leaves with the same tune, every engine is a little different. ~25-30 HP would be a good gain after a tune with a few more ponies for your little upgrades. the O2 sensors keep the air fuel ratio pretty much in check so you won't get great gas increases except at WOT where the factory rich tune dumps lots of unnecessary gas.
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2004 Blk/Rd M6
12.34 ET, 113.55 MPH 1.82 60ft
DIY OTRCAI|!MAF|HP Tuners|SLP LTs|FTI cam|SLP UD|BBK 80mm TB|2.5" Exh
Rip Shift|DiffTechshaft|Diamond Stg3 clutch|BFG DRs|Lovells springs|Koni|Harrop cover|SuperPro bushes|Hotchkis sways|3.91s
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