Just a note
2 1/4" works well on the 16v, combined with a K&N insert gives a nice feelable little power boost and a little better gas mileage.
Did it on my wifes 93 16v 4 door years ago and it works well.
As far as larger exhaust, needing back pressure.....
Well I disagree, I run a 1600/8valve sidekick engine, highly modified, in my aircraft...Modified Calmini header...no exhaust, just a dump tube. No adverse affects (other than noise) producing somewhere over 110hp |removethispart|@ 6000rpm.
Combination has over 100hrs on it.
See some pics here
www.zukiworld.com/forum/index.php?topic=176.0Just food for thought
Zag