Reducing downpipe I.D

IrishDave

Registered User
Thinking of reducing my down pipe from 3" to 2.5" where it passes the propshaft, using something like this http://www.ebay.com/itm/Vibrant-2-5...f8088cc&pid=100005&rk=2&rkt=2&sd=201418236259, then going back to 3", as it is constantly rubbing and is really starting to annoy the sh!7 out of me. I have had a few exhaust places try and fix it but to no avail.
Question is will this hinder performance, how much of a restriction is it likely to cause?
 

superkarl

MAN OF STEEL
Strategic dent
 

IrishDave

Registered User
Already tried the strategic dent and still rubs.
 

IrishDave

Registered User
Tried that also. I have pretty much tried everything. My last option is to reduce the pipe size, so I just want to know how much this will affect performance.
 

IrishDave

Registered User
The only time it has not rubbed is when the oe manifold was still on the engine.
 

vivalacoulter

Registered User
Strange, lots of people have gotten away with that downpipe. I suggest you give it another bash, eventually you'll make enough space.
 

superkarl

MAN OF STEEL
I know how bad can it be rubbing to not work with a dent.
What engine mounts do you have?
 

aragorn

"Stick a V8 in it!"
Staff member
Moderator
VCDS Map User
why do you think gaining 1/4" from going from 3" to 2.5" will make a difference if a 1/4" dent wont?

Make the dent bigger if need be.

Many OEM exhaust systems have huge flats pressed into them to create clearance for things.
 
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