Generation III Internal Engine 1997-2006 LS1 | LS6
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5.3 lmg mods for higher HP

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Old 08-15-2018, 09:30 PM
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I'm sorry but I do not know I just know i haven't changed it so it is stock. And I do not know how to check
Old 08-15-2018, 09:41 PM
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I would bet it's a 3.42
Old 08-15-2018, 09:42 PM
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Ok I just found the codes to see what it is I'll look at my sticker in glove box tomarrow
Old 08-15-2018, 09:44 PM
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Good deal! Then you'll know.
Old 08-15-2018, 09:45 PM
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Ok thank you and what are best gears ? 410?
Old 08-15-2018, 09:49 PM
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Depends... start with what you have and see how it runs with it. You can always change it later.
Old 08-15-2018, 09:50 PM
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Originally Posted by G Atsma
Depends... start with what you have and see how it runs with it. You can always change it later.
ok thank you
Old 08-17-2018, 12:49 PM
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Originally Posted by G Atsma
I would bet it's a 3.42
yes it is 3.42 with posi
Old 08-17-2018, 04:28 PM
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At this point don't worry about the trans or rear gears. 6L80's are very strong, just keep the fluid changed in it every 30-50k miles.

And with having 6 gears and them all being fairly short compared to a 4L60 you can get away with those rear gears easier than if it were a 4L60

Flowmaster dual 3" to single 4" is a really nice merge if you're looking at merges
Old 08-17-2018, 04:30 PM
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Originally Posted by 00pooterSS
At this point don't worry about the trans or rear gears. 6L80's are very strong, just keep the fluid changed in it every 30-50k miles.

And with having 6 gears and them all being fairly short compared to a 4L60 you can get away with those rear gears easier than if it were a 4L60

Flowmaster dual 3" to single 4" is a really nice merge if you're looking at merges
ok cool I was gonna try the y pipe then magnaflow high flow cat with a magnaflow bullet
Old 08-17-2018, 04:36 PM
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Originally Posted by IvAAssassin
ok cool I was gonna try the y pipe then magnaflow high flow cat with a magnaflow bullet
i would skip the cat unless you have to have it, in most places you can still pass state inspection without cats because the tuner can disable the rear 02 sensors in the tune and the inspection machine wont know the difference as long as the check engine light is off.
Old 08-17-2018, 04:39 PM
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Originally Posted by 00pooterSS
i would skip the cat unless you have to have it, in most places you can still pass state inspection without cats because the tuner can disable the rear 02 sensors in the tune and the inspection machine wont know the difference as long as the check engine light is off.
ok cool I didnt know if adding a cat helps with performed or not I was told something about back pressure but didnt know if he knew what he was talking about
Old 08-17-2018, 04:41 PM
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Cat will absolutely NOT make more power. If you get a good enough/big enough one it won't hurt but no, you don't need back pressure

Get on youtube and watch the engine masters episode where they test different exhaust setups

Cats are good for clean emissions, helping keep the exhaust quieter, but they do not increase power output
Old 08-17-2018, 04:44 PM
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Originally Posted by 00pooterSS
Cat will absolutely NOT make more power. If you get a good enough/big enough one it won't hurt but no, you don't need back pressure

Get on youtube and watch the engine masters episode where they test different exhaust setups

Cats are good for clean emissions, helping keep the exhaust quieter, but they do not increase power output
ok cool




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