99-LS1-SS

It seems like the Borla with no plates in it would serve the same purpose as a cut out. Isn't it a cut-out in itself? Am I missing something here?

Redlinez

iTrader: (5)

According to Paul at Thunder Racing there is no real difference between the solid plate and the big hole plate. I never noticed any difference at the track. Just sound.

99-LS1-SS

I don't understand how there couldn't be a difference. If that is the case then why do people run cut-outs? I thought that the point of a cut-out was to let the exhaust gases escape faster and less restricted. With that logic, there is now way that the exhaust gases don't escape any faster with the largest opened plate than they do with the closed plate and traveling through a muffler.

02redSS

thats not true

I bet some cars with run faster with a solid plate and some will run faster with no plate....just depends on the setup. But there is a difference


and I think an open borla is just as good as a cutout, but i think it sounds better, and probably has better back pressure

SouthFL.02.SS

Here we go with the back pressure thing...

02redSS

http://www.ws6.com/mod-5.htm

tell it to the dyno

SouthFL.02.SS

tell it to the dyno... again...

Ackattack1

iTrader: (7)

I'll vouch for the Hooker Catback.....take out three bolts and the muffler and tailpipes drop off for your cut out, plus save 40 lbs or so

JoeT/A

Your talking about a couple horsepower. That could be because the air temp changed, or the motor was slightly cooler when it was run. 1 to 2 HP on a dyno is consistant, you can't say that one is better than another.

The least amount of back pressure is the best. Why do you think all the big racers run open headers? If mufflers made more HP wouldn't they all have them?

02redSS

ok? what are the details on the setup? where is the cutout?

02redSS

ok, so as much as it supports your theory, it supports mine....it didn't make enough difference either way to prove either theory....

peak power, maybe....

it all depends what kind of power band you want....

my friend just put LT's on his car...he has borla and a cutout. He says it sucks driving with the cutout open now because the car has nothing down low....why? a little thing called back pressure.

but wait, we're all hardcore drag racers that care nothing about power bands right? take your cutout and peak numbers, i'll run my borla and take my torque

Drew98TA

That would be me! I tried running with the cutout open but i didn't like the way the car felt. Felt like when i just tapped the gas there was nothing there. I closed up the cutout and did the same thing and threw me into the seat.

btw- Aren't you supposed to be working?!?

BADFNZ

iTrader: (19)

The "big" racers run open headers because they never see low RPM's. They're either doing high RPM clutch drops or launching at high RPM's off a t-brake. Now if those cars were to drive around town, they'd notice a difference down low.

92SilverSHO

iTrader: (3)

i just put a cutout on my car and gained low end. The car came alive. I dont know about the dyno, but i know i gained some tq down low!

AINT SKEERED

iTrader: (2)

My cutout is under the passengers seat about 1 foot behind the Y pipe. with the Mac headers and Y-pipe being 2.5 inch , I gain 18 hp over my Edelbrock catback with heads and cam. THe power is from off Idle to redline. I gain 2mph at the track with open cutout.
I love the tone of the cat back though and works great on the street for not giving away that the car is not stock unless you are up close. A car on the side of me usually thinks its a stock T/A