QUASAR

iTrader: (6)

I was thinking about doing this. Puting the cutout on the back side of the axle where the tubing bends into the muffler. Do you guys think this is a good idea? The exhaust would flow right out the back instead of the middle. What do you guys think? Would it produce the same power as a cutout placed right before the axle?

<img src="gr_stretch.gif" border="0">

Bugblndr

Is it a good idea? Sure it is, it cuts down on the interior noise dramatically vs a cutout before the axle. Check out my dyno page for my results.

QUASAR

iTrader: (6)

Bugblndr, any pics of it? I know i have seen some on the net somewhere but cant find any pics of over the axle cutouts. And yes, interior resonance is one of the big reasons i would do this. <img src="gr_images/icons/wink.gif" border="0">

Bugblndr

Pic as requested

Richard

Colonel

Technically speaking, the closer to the engine, the better. Would you ever notice the difference? I doubt it.

SS SLP2

iTrader: (8)

try this for more info go to 2 nd or 3 rd page for complete info
http://kickme.to/jgruggles

Silver99Z

I have a ZED style cutout behind the axle, just before the B&B muffler. My muffler guy cut into the pipe and welded on a stub of 3" with a flange and cap. Then he made me a 3" extension pipe with a flange. On the street I keep the cutout closed, but on track I open it and bolt on the extension. So then I have three pipes. Anyway, with the cutout open, at idle, a fairly significant amount of exhaust still flows through the muffler and exits from both muffler pipes although most comes out the cutout.

Silver99Z

Brandon - looks like my cutout without the extension.

Hi Jason. See you next time in Rochester.

mykdiver

Mine is after the axle, less noise, and good power! <img src="graemlins/formula.gif" border="0" alt="[Pontiac]" />

Pro Stock John

iTrader: (34)

Back in 1998, we had this thing called the 'Poor Man's Borla mod' for 98 SS's with the single cannon exhaust. I bought a tip from a guy and added a cutout type exit and a tip... That exhaust and a lid picked up 13rwhp for me. Sounds like a Borla for a lot less.

Bambeezer

The over axle cut out worked really well for me. It was loud, but it didn't vibrate the interior. Here's another picture.

JasonShort

iTrader: (242)

Brandon, that is the coolest looking Formula I have ever seen! Love those FM5's <img src="gr_stretch.gif" border="0">

What kind of an increase did you see in performance with your cutout (track times)?

Thanks
Jason

Bambeezer

[quote]Originally posted by JasonShort:
<strong>Brandon, that is the coolest looking Formula I have ever seen! Love those FM5's <img src="gr_stretch.gif" border="0">

What kind of an increase did you see in performance with your cutout (track times)?

Thanks
Jason</strong><hr></blockquote>

Thanks! I can't remember any increase at the track. Sorry. <img src="gr_sad.gif" border="0">

Trevor @ Texas Speed & Perf.

iTrader: (3)

Brandon - That looks like one of Nick's famous cutouts. <img src="gr_stretch.gif" border="0"> I have one exactly like it.
I like having the cutout at the back a LOT more than under the car. It's a ton easier to get to, and it's NOWHERE near as loud inside the car. I use wingnuts to cap it up, so it takes all of 15 seconds to open it up. I've track-tested the cutout 3 times vs. running through my SLP dual/dual, and I saw no improvement in ET or MPH. That will all change later on after I swap out the heads and cam, but for a stock-internal LS1 the dual/dual is plenty. As for you guys with stock catbacks, the cutout should show an easy .1+ at the track.

QUASAR

iTrader: (6)

Brandon, can you see your cutout from behind your car? I am just curious as to what it will look like on my formula. I will be using it with a hooker cat back.

and thanx for all the replys guys! <img src="gr_grin.gif" border="0">

Trevor @ Texas Speed & Perf.

iTrader: (3)

Yes, you can see the cutout from behind the car.

Bambeezer

[quote]Originally posted by Trevor D:
<strong>Brandon - That looks like one of Nick's famous cutouts. <img src="gr_stretch.gif" border="0"> </strong><hr></blockquote>

Yup! Mine was actually the first he had done after the axle. It took forever for me to explain what I wanted.

98BLKMOBILE

I made my own cut out also, my car is lowered 1" so you really can't notice it from behind unless you get on the ground and look up. I dyno'd with it open and closed but only showed gains between 3 and 5 rwhp, seems like the normal dyno tolerance could come into play though. I do love the way it sounds, I run it open all the time. The cabin noise is much better with it over the rear end (I used to unhook it @ the intermediate pipe). Here is a pic, I hope this works.

http://www.geocities.com/brian98ramair/Dump1.jpg