Well there you go. Thanks for clearing it up. Drop the U-bend, and put on a new intake.

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2004 Impala SS - ZZP PCM, 3.4" Pulley, K&N CAI, TOG Headers, SLP Cat-Back, 180* thermo, Autolite 605s, PRJ Performance wires, Alternator rewire, GMPP Handling kit
2000 Grand Prix GT, Commuter Car - K&N CAI, GMPP Handling kit, ZZP downpipe w/U-bend delete, ZZP Plog, Alternator rewire

$800 1991 Corsica is my MPG mod....best money I ever spent.

34mpg all day long

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GreenBastardPerformance2000 GTP Coupe (the green bastard)
XP, Pacesetters, LS1 TB & MAF,MSD System, P&P LIM, P&P GenV w/ 3.2, 3.0, 2.8, Devil'sOwn Injected 100% Methanol,PowerTuned, TripleEdge Trans w/3.29's
12.92 @ 105mph

ok i can see how you can take this the wrong way but i also want to do the mods for performance aswell but was just wondering if any mod had a greater affect on mpg'g. i do know that by driving easy verses beating on the car can make about an 8mpg difference. so i do ndrive it easy now that i learned my lesson and had my fun but i still don't mind pulling up to a stop light with some friends and going for a little run. so the mods are first off performance based then MPG. i do know that when i did an exhaust on my dakota it made a 2 mpg difference while the cold air intake brought me back to square one. but they sounded good and did what they were made to do make HP. and that is what i wanted. the mpg's is a bonus.

ok thanks what kind of air intake would you suggest for a 2004 GT

Numerous threads on the best intake, or whether to go Fenderwell Intake or Cold Air box Intake. I have K&N CAIs. Higher priced than the others, but they are rock solid, the PCM screws into the box, not budgiecorded or ziptied, and you get everything you need in the box. I got mine from Autoanything when they have had 10% or 20% off sales, and its often free shipping as well.

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2004 Impala SS - ZZP PCM, 3.4" Pulley, K&N CAI, TOG Headers, SLP Cat-Back, 180* thermo, Autolite 605s, PRJ Performance wires, Alternator rewire, GMPP Handling kit
2000 Grand Prix GT, Commuter Car - K&N CAI, GMPP Handling kit, ZZP downpipe w/U-bend delete, ZZP Plog, Alternator rewire

Start off with a fenderwall intake or a cold air intake. You can make your own FWI for about 40 bucks, or you can buy something like the Wizaired from zzp which will be around 200.

Next is the exhaust. The major hangups for are exhaust is the manifolds and the downpipe. Look at either getting a 2.5" or 3" downpipe along with a set of ported manifolds, or a power log from zzp to replace the front manifold all together. (Its a tubular manifold.)

For some other minor mods, swap in 180* thermostat and you could run some NGK-TR55 gapped at .55-.60. They are 1 degree colder than stock spark plugs.

All those mods will increase gas mileage while giving you some significant gains with an l36.

These sites will be good.

ZZPerformance
INTENSE-Racing.com - Grand Prix, Bonneville, Regal, L67 3800 Supercharged Performance Products.
W Body Store - Don't Take SLOW for an answer!
Milzy Motorsports - American Muscle, Reborn
www.getoverkilled.ca

lmao good 0.02 =] its just so hard to not punch it here and there haha

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99 DARK BRONZEMIST METALLIC GTP SUPERCHARGED SEDAN. --MODS-- FWI, 104 plugs MSD coils and wires, 180 t-stat, dual thrush exhaust, Kenwood complete system 10' Sub ported, raised spoiler, red calis, D/S Baer rotors, Hawk Pads.

thanks for all your help i think im going to order a K&N later this week i just trust the NAME and they have been proven over and over. also ill do something with the exhaust soon.

Dont waste your money on the KN cold air intake kits. Just get a CAI from one of the vendors and run a KN filter.

The K&N sucks at what its supposed to do, provide cold air. The material its made of absorbs heat both radiated and through convection. At least something like the WizAired reflects radiated heat (aluminum has a much better emissivity rating) and the insulation protects the air charge from convection.

I see much cooler IATs with the WizAired than I've seen from other intakes.

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2004 Impala LS - got some mods
NAIOA Moderator

Making you think twice before picking on Impalas