It's better not to use more than 35w ballast due to its closed design. The extra heat captured inside the shroud might damage the shroud after some time. But i've heard some people still using 55w ballast with the stock shroud.
1 unit MR2 KKK turbo for sale
Spec : KKK K3T 3070MGA K26
Full serviced and used less than 3000km after service.
No freeplay and in good condition
Downpipe included and is plug and play for MR2.