4"Down pipe

[N2BUICK]

Anyone have experience of fabricating and installing a 4" down pipe,on our G body cars?
Will it fit !? (no a/c box)
Was using a fender well dump with my PT--88(sold).Would like to make an effort this time to get an exhaust system,with the new turbo.
Thanks
Austin

 

[JoyOf6]

Others have done it, and I had it done last Fall. I had a fabricator make it while fitting it to the car.

http://www.geocities.com/joyof6/Downpipe.html

Art

 

[N2BUICK]

Art
Thanks for the info and link to the pics.
Any chance that you have a wider angle of those two pics?
Is that your crossover beside the down pipe?
My stageII headers crossover in the front,not use to all that piping in that area!
Austin

 

[JoyOf6]

Austin,

Yes, that's the crossover (KB headers). If there were no crossover down there... would have cut the work quite a bit. I added a longer shot to the pic page.

Art

 

[VictoryTrans]

Its definitely do-able, but some people might question if its worth the trouble??? My dad just did it himself on his car, and let me tell ya, he didnt have fun

 

[summit]

We fit a 4.5 downpipe on Billy's car, Austin. It still has a rear crossover and exhaust system, but no A/C box.
Greg Kring
150MPH street car

 

[N2BUICK]

Looks like it is "doable"
If you guys put a 4 1/2" pipe there,thats good news to me.
Is Billy running a motor plate? There would seem to be very little room for motor torque,running a large downpipe?
I just ordered $Load of 304 stainless 90's and staight pipe.
I will see if the chasssis guy can make it work.
Its things like this that make you appreciate being able to call one our vendors and order a part that fits,as opposed to digging up the raw materials,finding someone to make it..... !
Austin

 

[TurboTR]

I was able to get the raw, pre-bent 4" dp from TH with no flange and adapted it to fit my ATR headers app. It was some work though.

Edit- whoops I mean the raw 3.5" pipe from TH...

TurboTR

 

[Taffy]

Originally posted by summit
We fit a 4.5 downpipe on Billy's car, Austin. It still has a rear crossover and exhaust system, but no A/C box.
Greg Kring
150MPH street car

Any pics? I would like to see how tight the fit is on that bad boy.

 

[Eticket]

Todd,

I just bought a TH 3.5" with a normal wastegated flange.. did you run into clearance problems with your ATR headers at all going down? Another guy on another post said they wouldn't work with aftermarket headers.. I just want to be a little prepared to beat on the downpipe I guess.

John Nguyen

 

[TurboDiverArt]

With TH supplies in question, are their other options for 3.5" downpipes?