This might take a while ...
1. Mazdaspeed 6 Point NR-A Rollcage
2. Yahoo Japan
3. It's Great! really stiffened the whole car up, Great design too, Much better then my previous rollbars. They don't come up often though, I haven't seen one since I purchased mine. It's still one of my favorite mods to date, Not only does it do it's job of stiffening the car and offering roll-over protection, It also looks great!
1. Carbing Strut Brace
2. Tetsuya Garage
3. It's ok, slighty stiffened up the front end, looks cool with the engine cover too (which is kinda why I bought it).
1. Flyin Miata frame rail reinforcement
2. Local forum group buy
3. Originally I bought the complete butterfly brace, but the centre piece didn't fit my car. Anyway turns out it fits on an NA so I guess I got the dud out of the GB. I noticed a massive difference when Installing these, the car was much more stable and it removed alot the chassis shudder these cars are known to have. I decided to keep the frame rails to protect the beat up factory rails.
1. Racing Beat rear subframe brace
2. Local forum
3. To be honest, I bought it for the bling. But I did notice a difference with it installed, Seemed to tighten and stabilize the rear end a tad.
1. Beatrush/Laile PPF Brace
2. Beatrush/Laile
3. It's great! got rid of my drivetrain shudder when turning (this is caused from my locker). Still need to tidy up the install though.
*edit*
Now I've installed the PPF brace properly (removed rear subframe bolts, used other bolts supplied in kit with new nuts and aligned them accordingly), It's made a great difference to drivetrain shake. It's bascially killed it, The car feels like it has an open diff again. Shifting has become somewhat easier as there is less shudder too. I highly reccomend this piece.
My gearbox/Diff does seem to whine a little now, And is noisy under acceleration. But I don't mind ... everything is noisy in my car :fab:
Next on the cards (bracing wise) would be a rear strut brace. I seem to have an addiction to bracing lately, Very keen to see what everyone else has and their brief reviews, I might get some more!