Exhaust Flange

[jwfchase]

Does anyone who has had the 2.5" exhaust mod done remember what was done about tying in to the flange? I took my van into a shop here in Kamloops, and they said they'd chop the current exhaust away from the flange and weld to it-- they said they don't have the flange parts. I know I saw some pics of someone who had their new exhaust running all the way into the flange, I'm guessing maybe they took the flange apart and reused existing parts? I think I remember it actually being 2.25 inch through the flange?

[fexlboi]

Apparently it's hard to get the right flange in 2.5" stainless for the Delica. I bought mine from Delicat who bought it from someone else. If it helps I could take photos.

[jwfchase]

So, to change from stock size the flange has to be replaced? (Makes sense!...)
I guess that's why most of the photos I've seen have involved the weld-on option!

[mararmeisto]

The exhaust hole itself is only 2" in size (or maybe even 1.75"), so any modification to a 2.5" or 3" exhaust is going to necessitate a transition piece. The simplest way is to keep a 'good' flange from the exhaust you're removing and have the muffler shop weld from there.

[jwfchase]

The exhaust hole itself is only 2" in size (or maybe even 1.75"), so any modification to a 2.5" or 3" exhaust is going to necessitate a transition piece. The simplest way is to keep a 'good' flange from the exhaust you're removing and have the muffler shop weld from there.

So leave the flange alone, chop off the stock exhaust close to it and weld on?

[jessef]

Just get 2.25" pipe welded directly on the flange leading to the muffler and 2.25 or 2.5" out.

Putting on larger than 2.25" at the flange will still create a bottleneck at that junction.

Anytime you have large pipe into small pipe into large pipe there will be a bottleneck.

I found after 3 side exhausts that 2.25" direct from the flange back was perfect. I had it installed after I removed my crappy 2.5" install and there was zero difference.

[Luna-Sea]

Hey,

I found after 3 side exhausts that 2.25" direct from the flange back was perfect.

Yes,yes it was and is. The lovely throaty sound is awesome!


Right On!

[jwfchase]

Anytime you have large pipe into small pipe into large pipe there will be a bottleneck.

I could use that as a venturi to draw in liquid smoke for when I'm flying the Deli in airshows...