Finished doing the B18C R swap in my 00 Si and the intake manifold is the last of the bolt ons im looking to upgrade before I move onto the internals sometime after the holidays. Was wondering if anyone had any suggestions on which brand to go with or which brands to avoid. Read up on a bunch but would like to hear others thoughts or experiences.

 

One serious intake manifold upgrade i can recommend is to get a hold of a P30 (2nd gen B16) manifold, and have it ported. Extrude hone is also very good with this mod, and it will make very decent numbers better than the stock P73 manifold your engine has stock. I am going to upgrade with this same setup on my B18C-R as well