[930gt-40r]

I know all about the popular tuner thing- Some of my customers in the Evo and Sti circles buy all their products based around "oh well tuner "A" says that this is the best product..."
Brian- you hit your target market head on with your products and shouldn't change them at all.
When regarding the primary size like you are talking about, it depends upon what you want to do with the car. Velocity= responsive and Volume= up top. Best thing you can do as a manufacturer is offer a mix of products that saticfy both while not driving your material cost through the roof.
And speaking of which, when are the first production Rarlyl8 headers coming? (pardon me if I missed a post earlier)