I was looking at the prices on mazdatrix's website for side seal springs.



I didn't think there was a difference between 13B-REW and 13BT side seal springs. I know they improved design of the cornerseal springs





Mazda trix list the side seals springs for the 13BT @ $1.57 a piece and 13B-REW @ $6.21



So did Mazda improve the 13B-REW springs?

 

i'm pretty sure they superceed to the same number in the real mazda parts system, i'll check tomorrow

 

Does anyone have any info on this yet?

 

I see no reason you couldn't be able to use the S4-S5 springs because the Mazdatrix part number shows the springs are used for both NA and turbo models. I don't see guys using the rew springs in their TT's for their big hp upgrades.