i think that the cheapest way to upgrade the performance of a non turbo 100/5000 is to simply trade up to a 200/5000T. the dirt cheap prices for the used turbo cars make most of the other options look quite silly really. it will not be as risky as unknown aftermarket pieces that mechanics may or may not know how to fix. $16K for a 1989 200TQ? perfect upgrade. my 2 cents.. eliot