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exhaust mod or air intake

PASTOR SCOTT

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PASTOR SCOTT Enthusiast

PASTOR SCOTT

Posted
Posted

Have a 04 5.3 burb. cant afford both, but of the after market exhaust system or the cold air intake mod what gives the best gas savings and power alone ?

 

 

 

thanks

 

Pastor Scott

 

ps which air intake is the best ? :banghead:

03GMCinBC Enthusiast

03GMCinBC

Posted
Posted

I did the exhaust and did not notice much difference in mileage. I think it is because with the new roar, I like hearing it so I am a little heavy in the foot. :banghead:

 

I have a buddy that did both on his AV and his mileage went down too, mostly because he also likes hearing his truck. He did say, after putting in the K&N FIPK that his engine sound was VERY much more noticable inside the cab. I rode in it the other day and did notice the engine growl. If your into inside quiet, that is not the way to go....

 

my .03

Mike G Enthusiast

Mike G

Posted
Posted

Well... On my 92 5.7 I changed out the dual exit factory muffler for a nice flowmaster and 3" exit. Made the truck sound a little deeper than stock but not overly loud by all means. This caused my torque curve to shift up in the power band. I think the GM vehicles like a little backpressure in the exhaust for low end torque. The truck really likes to stretch out on the highway now. To compensate for the torque drop, I went with a carb (TBI) spacer and a spacer which fits under the aircleaner can. This brought some of the low end torque back, but not like it was when all was stock. As far as mileage, it's now great on the highway but suffers a little in town.

 

For my wife's AV, I would like to swap out the mufflers only and then put a cold air intake on.

 

Just another $.02 (but that's all I have left) --Mike

dannyukonxl Enthusiast

dannyukonxl

Posted
Posted

id get an intake its probably better in the money / performance category my neighbor put one in his 5.3l avalanche and he claims to be able to fill up every other week instead of everyweek, but i hear good things happen with the 5.3 all over :banghead:

 

edit: i would get that new vararam intake seems killer :cheers:

LikeaRock14 Enthusiast

LikeaRock14

Posted
Posted

Muffler swap, i.e a 70 series, Spin Tech Truc/RV, 22" Magnaflow, and an intake. Muffler swap wouldn't be much, and the intake, you can find good deals.

Try Ebay for those too!

MyBigToy Enthusiast

MyBigToy

Posted
Posted

Do the exhaust first.

 

Then add a drop-in K&N and modify the stock airbox to give a quasi cold air intake. There are quite a few places that show instructions on exactly how to do the modification. Basically you cut a 4" hole in the bottom of the airbox and the metal mounting plate underneath the airbox. You buy a 3" to 3" 90-degree flexible plumbing coupler and mount it to the hole in the airbox. The front of the 90-degree coupler points forward to pull cold air in through the grille/around the headlights. The plumbing coupler costs about $10, the K&N is $40.

03GMCinBC Enthusiast

03GMCinBC

Posted
Posted

I like the Flowmaster 50 I have in my 5.3

 

I think it is mellow and a like riding around with the windows down. My wife says it is to noisy. I sat on the passenger side of the truck and for some strange reason, it does sound louder there :cheers:

 

Oh, well....

 

check this link out for some sound clips of the FM50

 

sound clips or

 

Flowmaster50

 

:banghead:

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