hi iv got a my94 wrxsti with a standard ecu and a scott t chip fitted is there a way to remap these old scoobys and is it worth while as im thinking of decat downpipe cheers

 

This website should give you the info you need. Try some searches on the subject as well.
PolarPerformance

There are many options though, most tend to go for a complete aftermarket ecu dedicated to the early cars.

I've been researching for myself, and at the moment, Simtek seems to be the buzzword but by no means the only one.

A lot depends on the features you are after, future upgradeabillity, mapper knowledge (the more mainstream ecu's tend to have a better coverage of competant mappers around the country), and of course cost.

There are quite a few advertised tuners who frequent this site, it may be a good idea to get some first hand advice from the hands on experts rather than the 'tinternet guru' ie me