the powerbrace 2 is pretty much standard parts apart from theres a bar between the two brackets......you can get lower chassis braces that bolt between the two for about 50-00 mate and it should do the same job
Or just get someone to weld a brace between the two tension rod brackets. The brace also has plates welded to the bottom of the brackets, but the S15 already has this, S14s don't.
Dean can you point out any other braces on the market that also brace across this area? yer i was considering just welding a bar across this area and save some pennies. Only reason for buying such an item is that i can have it bolted in in minutes as apposed to the hassel involved of doing a proffesional job of welding up the exisitng. Might give it a go thou!