Custom 07 up Y Pipe Project.

[NORCAL SS]

Well not doing long tube headers but looking at the stock Y pipe on my 6.2 esky lots can be upgraded.

Doing a 3 inch y pipe.

3 inch 100 cell cats ($230)
http://www.ebay.com/itm/MBS-100-Cel...Parts_Accessories&vxp=mtr&hash=item5d2e50a220



Dual 3 to single 3 y pipe by magnaflow 29.41
http://www.summitracing.com/parts/MPE-10798/


3.5 to 3 inch reducer (6.2s have 3.5 inch exhaust)
http://www.summitracing.com/parts/WLK-41980/


3 inch 45 and 180 mandrel bent 2 sets $120 on ebay
http://www.ebay.com/itm/MANDREL-BEN...Parts_Accessories&vxp=mtr&hash=item27a3967eaf


Couple of 02 bungs about $20.

And flanges to bolt to stock exhaust manfolds $30

So will be about $475 parts but getting rid of the 3 cats on our truck should open it up some.


Ill post up pics once I get all items here.

 

[InTruckDesign]

I will be following this closely.

 

[Zed 71]

Post some before and after vids ! It will sound great!

 

[stevek]

Why would you close up the exhaust a half inch just for the y pipe?

 

[NORCAL SS]

stock y pipe is 2.5 not 3 inches also very crimped under the truck. Will be 3.5 exit like stock pipe but no 3rd cat. I need to get under it this weekend to get some final measurements id love to do a 3.5 inch y pipe

 

[Zed 71]

stock y pipe is 2.5 not 3 inches also very crimped under the truck. Will be 3.5 exit like stock pipe but no 3rd cat. I need to get under it this weekend to get some final measurements id love to do a 3.5 inch y pipe

Hmmm, if the stock exhaust piping is 2.5-inch then increasing to 3-inch may reduce the exhaust velocity (reduce scavaging) which will result in a loss of torque in the low/mid range. IMO I would research a little more (GMFS forum) to see some real world results.

In any case, I would like to see you compare the dyno results with the last graph. Sounds like a fun project and looking forward to hearing it.

 

[NORCAL SS]

kooks long tubes are 3.5 inch y pipe. my tbss gained 17 rwhp going to a 3 inch y pipe and that was on a 6.0

 

[NORCAL SS]

Pieceing this together its way to much.
Flanges 110 oem from stainless works
All exhaust tubing 150
Dual 3 to 3.5 y pipe 110
High flow cats 210
02 bungs 30

Sooooooooo decided im going to just cut the large 3rd cat on my y pipe. Pipe will be replaced with straight 3.5 inch and will prob wake up the sound a little.

The 2 cats on the headers will stay in place

 

[Blazed]

I don't have an escalade. BUT
I took out the third cat on my Tahoe the day after I got my exhaust put on because I had previously taken my exhaust off of my 2007(no third cat)
And when I put it on the 2011 it sounded just awful and really airy to me and so I took out the third cat and it really opened up the sound a lot!
You'll be pleased.

 

[NORCAL SS]

yeah id love to cut them all off but just will be to loud. Ill get a before and after video.