Im planing on doing some porting on my s4 13bt irons and i need some advice on how big to go. I would like to do a mild port on the primarys and a larger style port on the secondarys. I have been reading a lot of differnt post about porting on this forum and i will be making my own template with plexi glass. here are some ideas im working with on the secondarys please let me know what u guys think.

I plan on being very carefull to avoid the water jackets if any one can give me essurments on how far up and down i can go that would be helpfull. thanks

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anybody????

 

[attachment=41751:attachment][attachment=41750:attachment] A few more pics. Please let me know what u think.