http://wot-tech.com/shop/la1-3400-pe...ds/cat_60.html
http://wot-tech.com/shop/all/perform...s/prod_66.html
Those are my flow numbers for stock and my parts. My parts are researched and perfected from years of giving a damn and in NO WAY represent what anyone else does.
3500 heads would simply amaze you i am sure. MPG and HP increase from bone stock 3500 heads and a ported lower would be very noticable and worthy of "daily driver" modification simply for the efficiency increase alone. Velocity is the answer.