blackfang

iTrader: (2)

Has anyone tried making a pass with the cutout closed and another with it open the same night? If so, what kind of gains did you get?

TA1364

iTrader: (11)

2.5 tenths, 3 mph but that was with some flowmaster muffler.

blackfang

iTrader: (2)

So it might be worth opening up my cutout then.

BlackScreaminMachine

iTrader: (17)

Cut Outs Generally gain. The question is does your have a track that has a Muffler restriction or DB restriction like E-Town, if not, then open her up.

z28rob18

iTrader: (7)

speed inc dynod achotrod's car befor and after a cut out. he gained a few horses

BlackScreaminMachine

iTrader: (17)

FYI Cut out placement and the engine combo will effect the end results, you may wanna consider checking the tune, if one goes on.

blackfang

iTrader: (2)

Engine is stock with a Lid, K&N and a catback. Cutout is on the I pipe right before the axle.

TA1364

iTrader: (11)

I'd bet it would be worth doing

boostednismo

iTrader: (5)

Mine is behind the rear axle and I picked up around 4-5rwhp. Haven't tested it at the track.

zracer323

iTrader: (12)

A lot of it will depend on your tune. If your AFR is dead on with the cutout capped you may go a little lean with it open and could slow down. If you are running on the rich side then you will probably see a small gain. Either way give it a try!

black01_WS6

iTrader: (13)

you will gain a little if anything, but it isn't going to hurt. All those little free mods and stuff like this add up. Open it up and post results.

Nitroused383

iTrader: (10)

I gained 17hp with my cutout over my slp dual dual. I always make a few passes with the cutout closed and when I open it I gain 1.5-2mph.

TORCHD 02 TA

iTrader: (39)

I never made a pass at the track with my cutout closed. So i have no idea what i am gaining/losing

And the day i went to get my car re-tuned, the damn motor on the cutout took a shiit

airfix

iTrader: (30)

I gained 1rwhp on the dyno with it open versus closed, located where most ppls are right under the pass side rear seat. Have not track times since my local track wont let me run it open.

TORCHD 02 TA

iTrader: (39)

why wont they let you run with it open?

What do they do to all the other cars that have open headers

dlk1950

I picked up 1.4 tenths in the 1/4

airfix

iTrader: (30)

No cars are aloud to run open headers in the street legal class (only class I can run in), They wont let me run it open beacuse the exhaust isnt going through a muffler, therefore its not "street legal". All the cars running open headers are not in the street legal class so there good to go.

SPRAYED Z

iTrader: (4)

17hp to be exact, my car has one and mine is a ls1, I opened it up on the track and gained 2.3 tenths and 4mph

chrs1313

iTrader: (24)

2.0 mph over the stock z28 catback...back to back runs actually forgot to open it and was like what the hell is wrong with my mph...lol

c0ncEpT

iTrader: (4)

Yup friend of mine made 33RWHP more with his cutout open than going threw his stock TA catback. I don't think he has ran his car at the track with it closed yet tho.