I am going to go diy, and i wasn't too sure which pipes to buy, and if anyone has a schematic on how to make a 4bolt dp-- it'd be greatly appreciated.

 

want to know also...TTT

 

I got my downpipe made @ my local exhaust shop. It was a custom downpipe with a 4-bolt Garrett turbo with the compressor on the drivers side. He used (1) 2.5" 90' bend, (1) 2.5"/3" reducer, (1) 3" bend, and some 3" straight piping. No flexpipe because my exhaust already had one on it. Price was extremely reasonable.

 

get 2 U-bends, one 2.5" one 3" or you can get both 3". I made mine with just 2 u-bends and a flange with $35 home depot rent-a-welder...

stan

 

sounds like i'll be doing the same thing. But i have a few questions
1) Where did you place cuts in the U bends and in what order did you weldthem together... A MSPaint image could explain this easily for me hehe.
2) Where was your turbo? compressor was on which side? What manifold? was A/C retained?
3) what kind of welder did you rent at homedepot? tig or mig welder?
almost forgot #4...
4) Where did you place the o2 bung and what did you use for the o2 bung?

Thanks so much for your help, i really do appreciate it...
Ryan

 

im interested as well!!

mike

 

do this, weld your flex pipe to the cat back flange( 3 bolts), then weld a long straight piece to the other end of the flex pipe. Now you have the bottom part of the DP done...

next, cut one of the U-bend at an angle to where it'll clear the AC compressor, about 45 deg ish once that's done, weld the DP flange to it.

now, you have the upper part, and the bottom part, all you need is 1- 90 deg bend to connect those two. You may not align the upper part perfectly to the turbine DP flange, so you may need to make a few small sections to get the upper part to the right angle to meet the bottom part. I made about 3-4 small section cut at different angle so that I can align the upper part and the bottom part with a straight 90 deg bend.


for the bung I use 18x1.5mm steel nut and weld it to the staright pipe part.

I use a regular 5 bolts turbo, the comrpessor is on the pass side, turbine housing faces the AC compressor, I have AC, I used a 2.5" on the first bend, as soon as it cleared the AC compressor, I flare it to 3" all the way back

the home depot welder is a core flux, weld looks nasty but it works and it holds fine...home depot don't even have mig, let alone tig....you can rent them at rental center for a mig with gas and etc...but you need to learn and practice first before you start welding, otherwise you'll start burning the pipes...

stan

 

nasty is an understatement. Get to work stan!!

 

How hard is it to use the core flux without burning the pipes? I really dont care how the welds look just if they hold.

 

what do you use to get perfect cuts for the pipes?

 

Here's one I made last weekend. Just go and buy a 4" radius 2.5" or whatever ubend and eyeball it!!! Cut with band saw, weld together!

 

what else can i cut the pipes with other than a band saw?

 

die grinder, but with cutting wheel...it really takes a lot to get used to cutting perfectly with a die grinder, but for less than 10 bucks, I ain't bitching..

stan

 

I want to know how cheezefrogs downpipe system works!

 

it works well

 

heres the first one I made.

 

could someone post a "good" picture of a maxrev downpipe, or a downpipe made for a 4bolt garret turbo? preferably for an integra, but doesn't matter too much

thanks,
ryan