Hi,

Has anyone performed gasket matching or porting (grinding away the material to match the gasket openings) on the above, I have seen a lot of folks in the US do this (and I have my plenum off still currently so..)

 

I am tempted to Gasket Match the plenum to lower plenum and open up while it is off giving me th eoption to add bigger TB's later. But then is there any point if I don't then match the lower plenum to the heads?:crying:

 

My feeling is that it won't make any discernible difference to the performance of my car due to the restrictions/limitation of the actual plenum itself. And that any real benefit would only be felt by those of you who are in the 500BHP club and beyond right?

 

Any comments, advice feedback or experience of same appreciated! :cool3:

 

Couple of pics to explain...

 

 

Every little bit you can do will help to be honest. Its prob too late to match the lower plenum to the heads if you already have the heads fitted but no harm in doing the rest.

I wouldn't be too concerned about the plenum as a restriction, the runners I think are about the same cross sectional area as a 44mm tube so not too bad for a 500cc FI cylinder really.

Thanks John - appreciate your comments as ever.