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L67 Lumina 3" exhaust?

S

stonecold0469

New member
should i do a 3" exhaust???

boost is at 6PSI at WOT
has 260hp/255tq
stage 1 intense blower cam
headers
FWI
lites 104s
180 Tstat
3.4 pulley
2 1/2 exhaust
tuned for the 3.4

i dropped to a 3.2 and got 3* KR so i took it off
i plan on doing some valvetrain work and need exhaust work since with headers everything is hitting everywhere...
would i get any benefits from a 3" exhaust????
 


Probably won't do much, what headers you got? If you don't need a cat, then remove it, or get a hi-flow one. 6 PSI seems low though, isn't stock pulley at WOT like 7?
 
nah your stock catback flows fine till 350 hp

To me it sounds more a tune problem than anything. You need a good custom tune to gain everything out of the cam you have.
 


The lumina exhaust has like 5 90 degree tubing its never comparable with the gtp exhausy! i know tune is so so but i still need to.make a new exhaust. This is why im asking if it helps to have 3" exhaust
 
Stock size is 2.5 give or take and at the bends around 2, and with how much power you are putting down its not an issue at this point.

you''d just be spending on something you dont need to have.
 
Hippo Machine said:
I think it might lower KR but also lower torque.
Click to expand...

*sigh*

Hippo, stick to leaves.

stonecold0469 said:
The lumina exhaust has like 5 90 degree tubing its never comparable with the gtp exhausy! i know tune is so so but i still need to.make a new exhaust. This is why im asking if it helps to have 3" exhaust
Click to expand...

Pics would probably help of your current exhaust setup. 3" probably isn't going to do anything to really help...

A cammed car on a wideband with headers should have no problem running lower than a 3.4"...sounds like a solid tuning issue like Cam said.
 


Forget about tuning it for a while, i need a new exhaust! Thats it! Mines crap! All bend up, welded everywhere and has areas where is hitting my car.

Would i lose?
Would i gain?

Or i should just redo the 2 1/2?

Im not trying to get rid of kr by doing the exhaust
I just need a new exhaust and since its the same price thats why i ask!
 


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That doesn't look bad at all.

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Thats a little worse, but granted you go mandrel its probably more than adequate.
 
Im gonna do it mandrel then! where can i find some mandrel??? Ill probably move the muffler to the drivers side! To see if I can eliminate the last corner
 
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