2.5 DP -> 2.75 cat -> 3 inch out - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Engine Performance This section is for discussion on all engine building related questions.
Sponsored by:
Sponsored by:

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 07-16-2013, 07:54 PM   #1
Senior Member
Thread Starter
iTrader: (2)
 
Join Date: Jun 2012
Location: New Braunfels,TX
Posts: 1,141
Total Cats: 51
Default 2.5 DP -> 2.75 cat -> 3 inch out

Anyone done this without welding. I am wanting to run my 2.5 fm downpipe and bolt it up to a 2.75 cat to a 3 inch catback. I figure since its only going up .25 each connection it may be alright? I see guys running 2.5 downpipes to stock exhaust so I figure I am in the clear.
ScottyP3821 is offline   Reply With Quote
Old 07-16-2013, 08:04 PM   #2
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,197
Total Cats: 2,584
Default

if your question is "is it possible" then the answer is yes.
been there done that

*edit: actually it depends on your flanges, but most of them should let you get away with it.
18psi is offline   Reply With Quote
Old 07-16-2013, 08:49 PM   #3
Senior Member
Thread Starter
iTrader: (2)
 
Join Date: Jun 2012
Location: New Braunfels,TX
Posts: 1,141
Total Cats: 51
Default

Thanks 18psi for the quick reply. I hope I wont be battling potential exhaust leaks. Part of me is very nervous as I hate jerryrigged things. Hmm maybe Ill get a 2.5 to suffice until I can go full 3 inch all the way.
ScottyP3821 is offline   Reply With Quote
Old 07-16-2013, 08:50 PM   #4
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,197
Total Cats: 2,584
Default

that's a terrible idea.

if you're starting from scratch right now, there's no reason not to go 3
18psi is offline   Reply With Quote
Old 07-16-2013, 09:00 PM   #5
Senior Member
Thread Starter
iTrader: (2)
 
Join Date: Jun 2012
Location: New Braunfels,TX
Posts: 1,141
Total Cats: 51
Default

Well I already have a 2.5 downpipe. Wife would kill me if I bought a full 3 inch exhaust right now. I have my eye on cheap 2.5 straight exhaust on the classifieds and I have 2.5 inch magnaflow sitting in my garage from another project I had. So I could just get it welded up. idk.
ScottyP3821 is offline   Reply With Quote
Old 07-16-2013, 09:02 PM   #6
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,197
Total Cats: 2,584
Default

You want a nice 3" midpipe? Mine's off an NB though not sure if it would fit (though I don't see why not). It tapers to 2.5" at the very back, so you could bolt it to your maggie
18psi is offline   Reply With Quote
Old 07-16-2013, 10:16 PM   #7
Senior Member
Thread Starter
iTrader: (2)
 
Join Date: Jun 2012
Location: New Braunfels,TX
Posts: 1,141
Total Cats: 51
Default

I been reading around and people are saying the hangers are in different spots
ScottyP3821 is offline   Reply With Quote
Old 07-17-2013, 03:12 AM   #8
Elite AbsurdFlow Member
 
Laur3ns's Avatar
 
Join Date: Mar 2008
Location: Enschede, NL
Posts: 2,058
Total Cats: 11
Default

I ran something like that and it made good power. Now, my AbsurdFlow with larger turbo and full 3" spools better, but it's from another universe.
Laur3ns is offline   Reply With Quote
Old 07-17-2013, 10:14 AM   #9
Senior Member
Thread Starter
iTrader: (2)
 
Join Date: Jun 2012
Location: New Braunfels,TX
Posts: 1,141
Total Cats: 51
Default

I bet haha.
ScottyP3821 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
FS/FT: 03.5 Mazdaspeed Protege leatherface24 Cars for sale/trade 15 10-16-2015 12:35 PM
Back to Stock Part Out!! Turbo Parts, MS2 Enhanced 01-05, Suspension, and MOAR! StratoBlue1109 Miata parts for sale/trade 16 10-02-2015 10:39 AM
Megasquirt 2 or 3 ? TheNomad Engine Performance 3 09-21-2015 11:20 PM
Can my stock ECU handle one more mod? TheNomad Engine Performance 30 09-19-2015 08:00 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 03:00 PM.