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Impala While undergoing many facelifts in its history, the Impala has proved itself to both civilians and police forces as one of the most capable 4-door cars GM has ever offered. Currently moving towards its 10th generation the Impala is one of the longest lasting and popular models.

2014 Chevrolet Impala
Includes: Bel-air
Platform: B-body & W-body

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Old 02-01-2010, 01:09 AM
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Default Looking to make my 03 Impala LS faster

I put a K&N filter on it which sounds very nice compared to the stock. What can I do to this 3800 that wont cause problems with the tranny or exhaust. I have thought about putting a dual exhaust system on it. I have heard that you can do a lot of mods to these engines. I have a feeling I would be best off with just the air intake and a dual exhaust. Any advice is greatly appreciated.
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Old 02-16-2010, 03:38 PM
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Hey i got a 05 LS (which has the 3800 series II) and i researched quite a bit n so far i have a k&n CAI and a flowmaster original 40 series single in dual out. I still havent received them yet but from what i heard it will sound pretty mean. The only thing i didnt do was delete the resonator and the u-bend. The u-bend doesnt make much difference but the resonator makes it sound a lil louder i dont think im gonna do it because i've heard they sound worse.
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Old 02-16-2010, 05:24 PM
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Exhaust and CAI will not make much difference. If you want to feel a difference a super charger is the way to go.
ASE Master Tech, L1 Advance Engine Performance certified
I will not answer repair questions by PM, if you would like my input you can PM me and ask me to reply to your public thread.
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Old 02-16-2010, 09:47 PM
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resonators dont make it louder. it actually makes it quieter. i had one on my truck last year with my 40 series muffler instead of buying like a 50 series muffler to make it quieter. i was stupid and listened to my sisters bf saying my exhaust was too loud with only a 40series. it made it quieter in the cab i finally said f**k it and put on a 10 series muffler.
You make life rough on your motor, your motor will make life rough on you...
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Old 02-16-2010, 11:25 PM
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Fred Bass Fred Bass

I'm with MDTAHOE, find a supercharger and put the low restriction exhaust and K&N on too 'cause you're gonna need 'em then!
"I USED TO CARE".......but I take a pill for that now.
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Old 02-17-2010, 09:25 AM
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Well yea if money wasnt an option then id go with the supercharger as well and some headers new piping new spark plugs and wires. I dont think i said resonators make it louder? I said deleting the u-bend and the resonators make it sound louder.
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Old 03-30-2010, 11:56 PM
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Join Date: Jan 2008
Location: Shelbyville, KY
Posts: 813

The U-Bend needs to be fixed. Straight pipe it. If you need help further modding PM me.
2003 Chevy Impala - Base 3400 - Few Mods
2004 Chevy Impala SS Indy Edition - 3800 Supercharged - Alot of Mods
Contact me for LED interior conversions
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