02SOMWS6

iTrader: (6)

I made the swap to a x-pipe to 3" duel.At the track I seen no gain what so ever.Just louder.Tell me it's in the tune.I have to go back next monday for a re-tune.I'm gonna bring my 3" cat back just in case my #'s dropped so I can pull the car on the trailer and swap out the exhaust.In my mind the x-pipe set up should make more.any dyno proof out there to put me at ease.

SouthFL.02.SS

Any gain in your MPH?

02SOMWS6

iTrader: (6)

No gain in mph. I did some other changes since my last outing-clutch,k-member-skinny's up front and x-pipe to 3" duels.Only seen a 1 tenth quicker ET with a better 60ft and the same mph.I'm installing my racetronics fuel pump this week and 42lbs injectors and have a shaner S3 to compare against my BBK, next monday it goes back for the re-tune.I hope it's all in the tune.That one tenth quicker I went is from the k-member, lower control arms and skinny's-no gain from x-pipe

GrannySShifting

iTrader: (10)

Dude you dont need 42 # anyway shape or form

02SOMWS6

iTrader: (6)

the injectors can be turned down enough in the tune.went that big cause down the road going with a stroker or sc or both

GrannySShifting

iTrader: (10)

ok, that is good reasoning! Reason why I asked, is Ive seen a sponor sell someone 42s on a mild 420 hp heads/cam setup, stock ones woudl have fuelled that car lol

CHRISPY

I would be interested to see this as well. People have made over 500RWHP NA through MAC midlengths and a MAC 2.5 inch Ypipe.

thechef

iTrader: (13)

who?????

SidewayzOZ

iTrader: (11)

I went true dual route for the sound. I didnt think there would be much difference between y pipe versus a dual system. Most y pipes out today flow pretty decently. My thinking was that the idea of diminishing returns comes into play with these exhaust setups when comparing a good flowing y setup to a dual. I also wouldnt think you will gain much with a tune unless the original tune was off.

CHRISPY

Pain...

Black02SS

iTrader: (36)

I have a graph from going from SLP Dual/Dual to 3" bullets dumped. The only other change was stock TB to S2. Peak numbers went from 378/363 to 380/378. The area under the curve was awsome. I will try and relocate that for you.

02SOMWS6

iTrader: (6)

I'm changing my fuel pump and injectors and were gonna see if the S3 will make more than a stock 80mm BBX. With my stock cat back I made 426rwhp and 406rwtq , I'm trying to get a little more out of it because my injectors were running pretty high on there duty cycle so I'm hoping the fuel sytem and injectors do the trick. I needed to upgrade both of those items anyway to get ready to spray.I'm running a split duration NOS cam so these #'s are pretty good for NA. What till I spray it.I think the x-pipe to 3" bullets would have to make more power.I'm gonna bring my 3" cat back with me to the tune just in case.It has to be the tune,has to be. Thats what I keep telling myself cause the money spent on the x-pipe to 3" could have been put towards a TNT kit.

Black02SS

iTrader: (36)

My dyno's are all done with a retune if needed. I still haven't had a chance to check my files, they are on my other computer, but I will see what it was like without any adjustments to the tune and then afterwards. I have about 40 graphs.

Black02SS

iTrader: (36)

Here is a screen shot of 3 of my dyno's.

#6 - SLP Dual/Dual, Stock TB, tuned

#8 - 3" True Duals Dumped, Ported TB, Untuned

#18 - Same as 8 but Tuned

JS

iTrader: (4)

Test them against a 3in single system w/cutout and guess what your gonna see..
The single 3in w/cutout BLOW the true duels away.

JMHO but I dont believe there worth anything over a single w/cutout.

SouthFL.02.SS

When I had a Y catback and cutout (open), my car was dead 'till about 3000 rpms. The duals sure did lots to put some power back in the low rpm dead zone.

Peak vs. Peak the cutout vs. duals will be similar. Area under the curve improves with the duals.

JS

iTrader: (4)

For a race car and a big stall the power down low is mute.
For a street car its GOD

Jason 98 TA

iTrader: (4)

We tested a open cutout car before & after true duals & the duals made within 2-3rwhp peak & made a little more in a few places down low. I kind of just look at it as the ability to run open cutout power with good sound

JS

iTrader: (4)

I'm sure it quiet compared to a cutout but fumes,speed bumps dont like x pipe setups in Philly.Plus I can run my system closed and be real quiet on the street and open it when I get the urge to sound mean.

To each is own,point being there worth tee tee over a cutout.

SouthFL.02.SS

A little extra tee tee down low...