Dyno Day

[sammy]

if you look in the summit cat. they have a 3 in x pipe thats a narrow one with the exact spacing you need all for 80 bucks

[-=Jeff=-]

There are some on eBay.. right center to center for less too

[XfireZ51]

Jeff,

The correct c to c is 4 1/8"

[Pete]

Originally Posted by XfireZ51

Jeff,

The correct c to c is 4 1/8"

Dom,you have a tolerance of i would say at least 1"

Since you'll be cutting the front and rear of the resanator you can move the pipes and insert them into the x-pipe,so you have some tolerance.

Pete

[-=Jeff=-]

Originally Posted by XfireZ51

Jeff,

The correct c to c is 4 1/8"

As Pete Said you are removing the current 'tied' pieces so the 1/8 would not be an issue

when I did the custom Resonator for my 89 is was 4" c-c, as is Pete's X pipe

[XfireZ51]

And speaking of Xpipes, I dropped ROZA NERO off at Al's to have the
MFlow resonator/Xpipe combo removed and the SW Xpipe installed. While there we looked at the SW unit. The pics I have posted here are taken from the direction of looking towards the motor. When we flipped the Xpipe around, we could see that the insert w the bumps was actually a
"cheese grater" style. IOW, the bumps are little cups when looking towards the diff and are there to slow the flow or disrupt it to a point. There still is a clear path for the gases to get out but certainly the turbulence caused by the cheese grater would affect that path. The backside of the Xpipe is much smoother and less disrupting, so Al has decided he'll install the Xpipe backwards with the smooth backside of the "cups" facing the flow. We're hoping this way the interference will be minimal but that we'll still get some benefit from breaking up standing waves in the pipe and therefore lower drone. In comparison to the MFlow
resonator and Xpipe combo which merge into one pipe in the resonator and then splits back out, the SW provides a pretty consistent 3" ID flow path for both banks. Cheese grater or not, it should significantly reduce backpressure. I am still a fan of the MFlow system. I like the low bass note it produces and the mellow exhaust note at cruise. And I think you get good value for the money. IMO, it clearly was capable of supporting a 400rwhp motor as my dyno runs and track runs showed last year. So for the LT-4 it was designed for, its a pretty good system. Beyond that seems to be its limits but I am only specualting until we see the results on the dyno. Hopefully that'll be soon before the snow flies.

[XfireZ51]

Picked up ROZA NERO today from Al's Exhaust Emporium and got a happy ending. He ended up removing the baffle inserts from the SW Xpipe. Its definitely louder and SOTP tells me definitely more power. Al says 20rw. I think I believe him driving this thing home. More responsive,better idle and it just flat out feels faster. I made sure I kept the ASR on getting it home. Overall interior noise isn't too bad. May need to go w Z06 flappers next.
Here's pics of baffle inserts:

[GOLDCYLON]

Great news all around. And.... The wife has a new chesse grater

[Pete]

Now that's doing it the right way.

Next,mufflers have to go.

Pete

[XfireZ51]

Originally Posted by Pete

Now that's doing it the right way.

Next,mufflers have to go.

Pete

Pete,

I'll try and get over by you thus week and see if you can tell SOTP
if there's a difference