should these port only be clean up or can they be ported a little

what will give bertter power

please post pics if any one as any

91 turbo

 

If you are running the factory ECU then i would suggest keeping them pretty close to standard, if you aren't limited be the factory ecu, then get them ported alot, so they match the opening and closing timing of the secondary ports (the PORTED 2ndary ports) this gives a lot better flow and = more HP, which is what everyone is after right?

There is a lot of info to be found about porting on the net, its a matter of looking in the right places for it, you can find alot of pics, info, how to's etc etc etc about it, if you are kinda clued up in pyhics and chemistry you should be able to add them together with the info available on the net and end up with some good flowing HP producing ports

 

say that fast 10 times in a row

 

http://www.mazdatrix.com/faq/porting.htm