Big Bridge Porting
*Adds larger second intake port at rotor. Very poor low-end response, marginal midrange, power is 7500 RPM and up. Not recommended for street driving. Removes water inner "O"-Ring at intake port area. Includes all intake and exhaust ports. Does not include price of housings. Done on new rotor housings only, supplied by MAZDATRIX. Requires carbon apex seals.
*Adds larger second intake port at rotor. Very poor low-end response, marginal midrange, power is 7500 RPM and up. Not recommended for street driving. Removes water inner "O"-Ring at intake port area. Includes all intake and exhaust ports. Does not include price of housings. Done on new rotor housings only, supplied by MAZDATRIX. Requires carbon apex seals.
Here's a good link for port info:
http://www.autospeed.com/cms/article.html?&A=0389&P=1
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