any one know of a CAI that works and makes real world HP for the g8?
K@n web site only shows panel filter right now for G8
oh btw flows sound good onthe G8..I had the car stock for about 10 miles.than had to change it
JOhn in Morgan HIll does wonders to waken up the beast

How about some pics?

What model Flowmaster did you put on?

sound clip or BAN!!!!!!!!!!!!!!!!!!!!!!!!!

How about some pics?

how about some vids? :p

What model Flowmaster did you put on?

Details?
Clips - video w/sound?
Please?

More Info Please!!!!!!! Thanks.

Screw pics. Video w/ sound!!!

Oh, and just muffs? Isn't there a huge resonator on these bad boys? I'd wait for a full catback.

Concerning the cai, make your own?

Coolness! Please include more info as well as pics and a sound clip if possible. :)

I've been seeing a couple of posts that say the CAI would decrease HP unless you got a tune specifically for this....(due to the MAF or something) Anyone know if this is true, or what the specifics are?

I agree with the rest... videos and or a sound clip would be great!

:popcorn2:

which flowmasters did u go with? video please!!!

I've been seeing a couple of posts that say the CAI would decrease HP unless you got a tune specifically for this....(due to the MAF or something) Anyone know if this is true, or what the specifics are?

well one some newer engines(well the new mustangs anyways) a CAI wont really do anyhting without a tune. something to do with the way the factorty programmed the car. i dont no if this holds true to GM engines but thats how it is on the 05+ mustangs. you have to get a tune or you just waster your money pretty much.

Anyone else know what, if anything, a CAI will do for you without also getting a Tune? And if a tune is needed, what is it about these newer cars that requires both to see more power?

Anyone else know what, if anything, a CAI will do for you without also getting a Tune? And if a tune is needed, what is it about these newer cars that requires both to see more power?

More air with the same fuel = lean A/F = :bomb:

Is the sound clip ready?

Anyone else know what, if anything, a CAI will do for you without also getting a Tune? And if a tune is needed, what is it about these newer cars that requires both to see more power?

The cars already fight between being too rich, then adjusting and becoming too lean. A tune will fix that up.

The MAF has its own calibration inside it tuned for the application it is installed in. Change the way air flows and it has difficulty measuring air based on its internal calibration.

A custom tune will adjust the ECM to meet the new demands of the uncalibrated MAF due to the CAI install. It bascially adapts the cars computer to the MAFs new readings. A tune will also fix the Air/Fuel ratio being too WIDE during adjustments which is why many see economy improvements after a tune.

A handheld programmer usually takes the AFR from 12% to 8-10%. A ECM Swap usually brings them closer to 5-8% and a custom dyno tune usually gets the AFR to within 2-5%. What i mean by this is the computers adjustment from rich to lean can be off as much as 12% on a new car.

A CAI on an untuned vehicle can widen this gap costing you precious HP and fuel economy.

A CAI on an untuned vehicle can widen this gap costing you precious HP and fuel economy.

Is it the same w/catback?

Is it the same w/catback?


I can't answer that. I would assume so. I am thinking the reduced back pressure will lower the Catalytic Converters temperature causing the O2 sensors to run cool which may cause the ECM to lean out the mixture to heat up the CATS and the sensors. Which may or may not be the appropriate thing for the ECM to do.

Similar to running Long Tube Headers and placing the O2's too far down the pipe.

Needless to say, the car may sound like its is moving faster, but did it do any good on an untuned engine?? I dunno. Maybe a Professional can chime in.

WELL.... WHERE'S THE VIDEO????

right here...

http://www.g8board.com/forums/showthread.php?t=868&page=2

scroll to the bottom...

I can't answer that. I would assume so. I am thinking the reduced back pressure will lower the Catalytic Converters temperature causing the O2 sensors to run cool which may cause the ECM to lean out the mixture to heat up the CATS and the sensors. Which may or may not be the appropriate thing for the ECM to do.

Similar to running Long Tube Headers and placing the O2's too far down the pipe.

Needless to say, the car may sound like its is moving faster, but did it do any good on an untuned engine?? I dunno. Maybe a Professional can chime in.


So really, the point is that we shouldn't make intake or exhaust mods unless it's done by a pro tuner that understands the HP impact of the mods on the car considering its programming. Correct??? I want my car to sound meaner. But, I DO NOT want it to sound meaner but end up with less HP than stock.

I can't answer that. I would assume so. I am thinking the reduced back pressure will lower the Catalytic Converters temperature causing the O2 sensors to run cool which may cause the ECM to lean out the mixture to heat up the CATS and the sensors. Which may or may not be the appropriate thing for the ECM to do.

Similar to running Long Tube Headers and placing the O2's too far down the pipe.

Needless to say, the car may sound like its is moving faster, but did it do any good on an untuned engine?? I dunno. Maybe a Professional can chime in.

no wonder is doing better, even with Flowmaster flow numbers, but that's another discussion :)

is this what you had stock ?

Pics from the G8 exhaust

http://g8gt.com/attachments/158d1171382462t-ex1.jpg
http://g8gt.com/attachments/159d1171382462t-ex2.jpg
http://g8gt.com/attachments/160d1171382462t-ex3.jpg
http://g8gt.com/attachments/161d1171382462t-ex4.jpg

more importantly, what you had in your rear mufflers
:eek2:
stock rear muffler
http://g8gt.com/attachments/318d1175706782t-stockve.jpg

http://g8gt.com/attachments/341d1178078517t-muffler.jpg

WWWOOOOWWWW!!!!

A damn miracle any exhaust moves at all.

more importantly, what you had in your rear mufflers
:eek2:
stock rear muffler
http://g8gt.com/attachments/318d1175706782t-stockve.jpg

http://g8gt.com/attachments/341d1178078517t-muffler.jpg

Cheap mod.... Long drill bit through the tips? Not sure if it'd work or not but I'd like to see someone try...:popcorn2:

I can't answer that. I would assume so. I am thinking the reduced back pressure will lower the Catalytic Converters temperature causing the O2 sensors to run cool which may cause the ECM to lean out the mixture to heat up the CATS and the sensors. Which may or may not be the appropriate thing for the ECM to do.

Similar to running Long Tube Headers and placing the O2's too far down the pipe.

Needless to say, the car may sound like its is moving faster, but did it do any good on an untuned engine?? I dunno. Maybe a Professional can chime in.

this is all in regards to a catback

no a cat back wouldnt do the same. all a cat back will do is change the sound. you wouldnt find much noticeable power from JUST a catback exhaust. cuz think about it all it is new mufflers and a bit better flowing pipes. also from waht ive been told on the newer cars jsut changing the catback doesnt effect that backpressure that much unless you make a drastic increase in pipe size for example going to a full 3" exhaust from a 2" exhaust might cause an unfavorable amount of backpressure. but id say for more then 3/4 of applications a cat back is fine. all catbacks do is change the sound anyways. only cars ive seen pick up HP from a catback is S/C cars and even then its not taht notiecable. some people dont understand this that MOST of our cars dont make enough horsepower to be worried about how good the mufflers flow

waht kind of crossover is in the midpipe? is it just the chamber like pro-chamber? or is there an X or H in there

this is all in regards to a catback

no a cat back wouldnt do the same. all a cat back will do is change the sound. you wouldnt find much noticeable power from JUST a catback exhaust. cuz think about it all it is new mufflers and a bit better flowing pipes. also from waht ive been told on the newer cars jsut changing the catback doesnt effect that backpressure that much unless you make a drastic increase in pipe size for example going to a full 3" exhaust from a 2" exhaust might cause an unfavorable amount of backpressure. but id say for more then 3/4 of applications a cat back is fine. all catbacks do is change the sound anyways. only cars ive seen pick up HP from a catback is S/C cars and even then its not taht notiecable. some people dont understand this that MOST of our cars dont make enough horsepower to be worried about how good the mufflers flow


Excellent post - very true!

Just from the pics bluegoat06 posted looks like the stock G8 exhaust is set up in a jig.

Could this be the signs of someone mocking up an aftermarket catback for the G8??? If so WHO?

that was in australia....

but hit up Stolen fox for some axel backs...