went to smg to get my car tuned and dynoed
i was told my 3in is hurting my car i think i am going to but the 2.5 downpipe and go back

 

Now we see the graph =D

 

what kind of power did you make cant see it?

 

really?? crap, I just bought a 3in off of japeater, if it doesn't work good with your mods, it defiantly won't work with mine.

 

dyno sheet is up now

 

The 3 inch isn't killing your performance. With the mods you have you can get more out of it. What afr are you running, how much timing, any supercharger/torque restrictions, etc?

 

I've seen more horsepower out of a 2.8 car with stock exhaust.

3" is to large until you break 300 whp mark.

 

i think it is like 26 or more degrees of timing and air fuel is about 11.6

 

its not the exhaust, its the tune. i made 23whp and 12wtrq more than that with your mods(different brands) minus the dual pass and on a 2.8

iirc 07MetallicSC is tuned by them on a 2.8 and he put down like 230s

 

At what point is a 3" all the way, a good thing?

 

well with a tvs, its basically manditory. for me, i put down 273/250 with:
3" intake
2.8
60s
ottp h/e
meth
header w/ 3" exit
3" catted downpipe
3" catback

 

Could lean it out a bit more.

 

it was rain slightly wail we were tuning, so it was very humid. i don't know how much of a difference it would make but the car runs a lot smother and pulls harder then it did with the trifecta tune. also it was dynoed in 3rd gear so we could keep the car cooler to tune it

 

yeah you won't really see any difference dynoing in 4th vs 3rd. people just choose the lower cause the wheel speed is way too high in 4th at the end of the run. i'd look around at getting a custom tune from someone using hpt that knows what they're doin

 

i like how you say find someone who knows what he is doing
fred is one of the best tuners around

 

damn only 250. I got zzp stage 3 with 2.8 pully and badmab header on stock exhaust with torque damper and ported and pluged blower if I dont get around 260 or more im gettin ported head, cams and so on... but im going to get a dyno soon and compare. I was told dont go 3" unless you go turbo

 

you wont get 260 on a zzp tune

 

hahahah <3 that **** ^^^^

 

You sold your Magnaflow and got the three inch......I still believe the old rule of thumb......an inch for every 100 horse power.

 

here is a vid. this way only the second pull. meth not on and it is a 4th gear pull
http://www.youtube.com/watch?v=8yOcu6QVg9Y

 

then prove me wrong and go dyno on a day it hasn't rained. low humidity. and see what you do. cause honestly you should be in the upper 260s if not 270s. and torque should be around 250

 

how much are most boost are most people getting with a 2.7 and 3in exhaust i only get to a little over 15lbs

 

What are your supporting mods? Sounds WRONG, my have a full 3" and i see upwards of 18

 

zzp s3 heat exchanger, gm dual pass, 75% meth 25% water 7gph nozzle, raw 3in intake, zzp midlength header and downpipe catless 3in, hahn 3in catback

 

i doubt that the 3 inch is hurting you, since when does back-pressure matter on a blower car?