Mazda Rotary Club

Cars by Model Type => 2nd generation RX-7's => Topic started by: Koose on August 31, 2010, 08:26:29 PM

Title: 3" decat do i need a 3" downpipe?
Post by: Koose on August 31, 2010, 08:26:29 PM
Hi folks

I have a 3" decat and cat back, the cat is too big to mate up to the oem downpipe. Do i take iti need a 3" downpipe? Does the \'downpipe\' bolt straight to the turbo ?

Many thanks

Mark
Title: 3" decat do i need a 3" downpipe?
Post by: TiddlesRX7 on August 31, 2010, 08:40:47 PM
The down pipe does bolt straight onto the turbo yes. If you\'ve tried the decat on and it doesn\'t fit to the stock down pipe then yeah your gonna need a bigger down pipe too to go with your decat.
Title: 3" decat do i need a 3" downpipe?
Post by: dthebuk on August 31, 2010, 08:54:05 PM
ive got a 2.5 inch jap downpipe and cat which both mate up with my 3 inch system.

the cat is hollowed out if you want it all?

or you could go somewhere like power gains and they can change the flange on either the cat or the down pipe. Probably more worth while going for a propper downpipe
Title: 3" decat do i need a 3" downpipe?
Post by: L18M on August 31, 2010, 08:54:28 PM
de-cat and cat back?
as in cat back exhaust and also a decat section? or is it all in one?
if its seperate then just bolt on the cat back for now til u find a 3" downpipe.
should mate up to the cat no probs.
Title: 3" decat do i need a 3" downpipe?
Post by: Koose on August 31, 2010, 09:36:01 PM
Nope, the exhaust system wont mate to the cat either, they way smaller than the 3" hole and flange. :(
Title: 3" decat do i need a 3" downpipe?
Post by: yehreally on August 31, 2010, 10:12:37 PM
I have a new FC3S decat which you can have cheap (email me) and maybe make use of it to make a connector to the downpipe :Thumbsup! :xconfused:Tongue1:2Rolleyes:eek
 
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