Polishing the INSIDE of the plenum is strictly a power mod, but how much power you benefit vs the effort (time/money/effort) is debatable.
Only reason I have it is I got one hell of a deal :)
And thanks to Guapo... I got my first ride in a Twinturbo... at speed... on a race track. I'll just say 'Damn' and leave it at that.- Tu 09/13/04 12:03:59