Comparison of downpipes
 

At the last open house we were able to compare Cottons
external waste gated downpipe with on of the Chinese
knock offs commonly found on ebay. Here is a pic so you
can see for your self.

Thanks again Rob,

As we saw, the DP on the right with the small discharge hole would not be able to control boost. I have customers that bought that DP and complained they could not get the boost below 25lbs, the hole needs to be enlarged. To be able to control boost we have to be able to divert exhaust away from the turbine wheel, if the discharge hole is too small, we will not be able to divert enough exhaust. What bothers me is the thickness of the exhaust flange, it is plain too thick. I'm not sure how far out the flange could be ported and I am also worried the flange opening for the DP may not be able to be ported out to flow properly when using a larger Q or S trim turbine wheel. I give the pipe an A for appearance, it is prettier than mine with the polished pipe... but thats about it.... :)

:eek:

Bryan

Cotton's Custom 3.5 external gated down pipe.
 

The body was off the frame of our car in my shop here in indiana, the engine block at the machine shop, my headers and cross over pipe in Jacks hands.

I told Jack I was eliminating the A.C. out of the car, Jack did not tell Brian. (Brian I swear I told him). Brian welded up a Fricking awesome down pipe. He cut the cross over pipe of my Kenne Bell headers apart and rerouted it and welded it back togethor. I always hated how that thing use to fit. He made the custom 3.5 down pipe fit great around the headers, then he welded in the EGT bungs onto the headers.

One of the photos below was taken before I installed the trans. I would bet a months pay that this thing would clear A.C. if I had it.

Here is another photo of it in the car. Remember Cotton's did not have the car when they made this down pipe. Not to bad hey?

The kid does awsome work!

An absolutly BEAUTIFUL JOB;)

By the way... it does clear with AC.

Bryan

I was trying to get the car positioned so a photo of the down pipe could be taken. Looks like I will need to try a little harder.

ANY WAY THE DOWN PIPE IS WORKING GREAT!!!!!!!!!!!!!!!!!

Wow, the car looks great, got anymore pictures you can share. How bout a little more info on your car.. inquiring minds want to know... not to mention I could use another 10 of the AC delete sill plates... :)

Thanks Jack,
As you know I have been working on this car for a while. The car now has 8 1/8th miles passes on it. It made it down the 1/4 the first time this Friday at Pinks All Out in St. Louis. I went 10.20 @ 130.33 and then on Saturday I added one more pound of boost on the launch, and it went 10.16 @ 131.76 with a 1.41 60 foot time. The car goes back to the wife now:)

Stock Block
Champion aluminum heads
Th 400

8.5 rear end Moser axles and a spool

HR parts and stuff suspension

Complete Aeromotive fuel system

Custom down pipe.

Torgue tech exhaust (hopefully coming off this winter it is way to heavy, and I do not like the way it sounds, love the way my friend Tim's Cottons single shot exhaust sounds)

The car weights 3700 lbs with my wife in it and 8 gallons of gas.