Intercooler2

iTrader: (24)

I have the cutout in the 4" section before the stock catback. I made 345 HP/ 352 TQ closed and 353 HP/ 359 TQ open. This was on a Mustang Dyno so I didn't get the gain some people see (was told 20/20). Does this mean my setup is doing pretty good as-is? Now I need to see what I can get at the track with it.

Damian

iTrader: (89)

Was there a retune immediately after the switch? If not thats probably why you're gains are so low with the cutout open.

Intercooler2

iTrader: (24)

No retune. We set it up for the street since that is mainly what I do. So what kind of times would this equal? Dynojet is supposedly more so how much is the correction and crank HP number?

01SuperSport

iTrader: (7)

Don't know about the numbers but your car should be in the 12's for sure

Intercooler2

iTrader: (24)

Mid or high?

Intercooler2

iTrader: (24)

First video closed up is finally loaded:
http://s236.photobucket.com/albums/f...t=MVI_0165.flv

GG01SS

iTrader: (1)

No way you will see 20hp gain from a cutout, with my set up I was very happy with 11 hp gain w/ cutout opened.

Intercooler2

iTrader: (24)

Open cutout:
http://s236.photobucket.com/albums/f...t=MVI_0166.flv

Intercooler2

iTrader: (24)

What did you dyno? I see you are below mid 12's and don't see headers listed.

94'BLKBRD

iTrader: (76)

High 12's with no suspension and with a tire..... mid 12's with suspension/tire

Deerhunter-Z28

Your gains are on par for the mods you have. No way you would see 20/20 with your current mods.

LS184

iTrader: (7)

not bad

02BLACKTAWS6

I think you are doing well for the mods that you have.

slowandrichws6

iTrader: (2)

+1 i agree not bad results for what you have done

GMCtrk

iTrader: (23)

What exactly needs to be retuned for an open cutout?

slowformula

I would be happy with the gains that you got.

GMCtrk

iTrader: (23)

Here's the dyno of a stock LQ4 stock exhaust vs. cutout. Not really relevant to the OP's specific situation, but shows that 16rwhp is probably best case scenario.

rel3rd

iTrader: (43)

It's almost impossible to guess, since there are way too many variables, IMHO...

Perfect example:
My 3755# A4 car made 344rwhp/314rwtq on a Mustang Dyno, yet runs 11's with ease (best of 11.67@115, 11.80's@113 in the heat). I have 275/50 drag radials, but ZERO suspension work done, aside from a Spohn adj. panhard bar, which does nothing for traction, and a set of older non-adjustable SLP boxed stock lower control arms, which also do nothing for traction.

I did just install a cutout (and 410's to replace the 342's), just to see what, if any, changes it makes at the strip.
Since open exhaust means leaner a/f ratio at WOT, I intend to richen up wot using my HPTuners.

GG01SS

iTrader: (1)

I dynoed on a dynojet a couple of years ago with current mods minus the ported TB, I dynoed 328hp/341tq cutout closed and 339.5hp/353tq cutout opened. No Headers just Bassani ORY w/ cutout. Mid 12's was w/ a 1.89 60', before clutch started slipping. Clutch works fine on the street but before I head back to the track will need to upgrade to a LS7 clutch and Flywheel.

Intercooler2

iTrader: (24)

Wish I knew how much to add for the Dynojet conversion. I think Fran said 6% so that would mean 375 HP in my case but someone with more knowledge may know. My helmet is on the way and I have plans for next Wed to race since temps will be high 30's. Should run damn good then!