civiceg500

I just bought myself a welder and my plan is to build a 3" turbo exhaust system from the downpipe to the muffler. The problem is that the only thng i can find was a t3 downpipe exhaust flange with a 2.5 in hole for the pipe. Would i be able to put a 3in pipe on that kind of flange with a 2.5 in opening. It's the 5 bolt flange for the side of a t3 turbo. I'm running a .63/.60 turbo and i built a Z6 from cam to forged rods for high boost. I wanted to create a bigger exhaust for the turbo.

45psi

just bore the hole out to 3"

whiterice

yes you can weld a 3" to that 2.5" dp flange.
you could also just find a 3" 5-bolt dp flange. i think turbo-performance.com has them and i've seen them on ebay.
anyone have some links?

W O T

Mike @ LSDMotorsports carries them pm him

bumblezc

When I did mine i used a 2.5" to a 3" Exhuast Adaptor. One of the tappered pipe reducer things. Just cut it to be as long as the reduction and it worked fine. It was for a 14b turbo. Couldn't fit the pipe directly to it otherwise the bolts wouldn't go in.

Heath

I think I have a couple. They are 5 bolt but there is more than one style. SS laser cut but one or two of the holes didn't cut cleanly and had to be drilled.
$17 shipped to anywhere in the lower 48
Email me at morganf1@aol.com for pics

Turbo242

if your talkin about teh waste gate flapper housing then bore it out, go from 2.5-3in, or by a differetn housing i.e lotus esprit

d0nfry

i don't think it will make a difference weather the hole be 3" or 2.5 because the hole for the exhaust wheel probably isn't more then 2.5"

Donald125

Unless the turbo outlet is larger then 2.5 inchs otherwise i would just use your 2.5 flange and weld a 3' pipe on it