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I also debated 3.91 vs 4.10 especially since the consensus seems to be 4.10 with a manual. I went with the GM 3.91 gears for reliability plus I get a pretty good deal on them. First gear is basically non existent anymore for me. Shift out of it pretty quickly, maybe not even use it if launching the car. I couldn't even imagine if I had 4.10's. Now with that being said I often wonder how much more fun and potential there would have been with 4.10 gears, but when the weather is nicer I daily it as much as I can and 4.10's would be too much for that IMO. Hope that helps.
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BBK Long tube headers, Hi flo cats, straight pipe muffler delete with j-pipes. K+N CAI, Soler Performance Ported Throttle Body, Soler Performance Throttle Controller, Phantom Grill, MGW flatstick shifter. 3.91 Gears, Ported Rod Mod Intake, ZTA Spoiler, Rohana RC22 20x10 20x11.

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