affordable mods for 85 rx7

i just bought an '85 rx7 and was wondering what types of inexpensive mods are available to boost performance. i'm not overly familiar with rotary engines but want to learn. (more interesting than the 4-banger i'm used to) any tips you could drop me would be greatly appreciated.

Get a performance air filter and a sports exhaust, this should improve power by up to 10Bhp - they reduce the airflow restrictions and allow the gasses to flow easier. Either that or get nitro!