exhaust size..

[MAZDA_SPEED]

i read a few forums about your exhaust size. some say its 1.75", others say 2.25"...which is it?(screwy), and is the stock size ok for modding?

[fellfrosch7]

Most of the piping from the cat back is 2.25". However, all the way up front (J-pipe and midpipe area), it does neck down pretty bad, I'd say 1.75-2" at most.

[Matrix]

...and is the stock size ok for modding?

No. No it is not. Go bigger. Thank you. End transmission.

[junya1985]

i got corksport 2.4 def. go bigger such a BIG difference

[mazdaspeedwerx]

size does matter so bigger is better

[BadBandar]

For turbo cars. 3in is probably the best choice. But i got the corksport 2.4 and i like it.

[theEZV]

2.5 is more than enough for the power most us are gonna make.

[tweakingmsp]

http://www.mazdas247.com/forum/showthread.php?t=67805

6th paragraph down says a lot.

[MAZDA_SPEED]

thanks much guys,
if i decide to make my own custom exhaust, where can i find the pipe flanges? and what kind of cat should i use, ive seen cats on ebay for 70 shipped, those any good?

[blkspdfreak]

i have a 3.0 inch all the way to the pre-cat. sounds deep like a wrx but bakc fires when down shifting like a srt-4. im thinking of a silencer.

[69RMSP]

Most people chose 2.4 to 3.0 and it really doesn't matter on this choice with our turbo. If you plan on forging the motor and going with a bigger turbo get a 3'' if not 2.4'' is perfectly fine. Cork-Sport sells a good exhuast for a cheap price.