For best results try to find a exhaust thats shorter...
http://bukupower.com/smallBlock.html
Its the most expensive ($110) exhaust i've ever seen but its the best i have seen also. I have yet to hear someone say anything bad about this exhaust but its also only been on the market for less then a year... i think. But this exhaust system would do wonders matched with an .18TZ
As for a good side exhaust
http://www.vantageracing.com/site/v2-products.html